This document provides a protocol for imaging the deep brain of freely moving mice. It describes:
1) Implanting a guide cannula into the mouse skull to access the brain region of interest. This involves drilling holes, inserting screws, and cementing the cannula in place.
2) Precisely positioning the cannula using stereotactic coordinates to target a specific brain structure.
3) Inserting the cannula 300-600 micrometers into the brain depending on the target depth.
This 3-sentence summary provides the key details about the protocol:
The protocol describes how to implant a guide cannula in transgenic mice expressing fluorescent proteins to allow insertion of a fiber optic probe for imaging deep brain structures of freely moving mice under anesthesia. The guide cannula is implanted using stereotactic surgery and then a fiber optic probe is inserted through the cannula and lowered to the target brain region under microscope guidance for in vivo imaging of fluorescent cells over multiple time points.
This document discusses measuring and classifying accommodative convergence/accommodation (AC/A) ratios. It defines the AC/A ratio as the change in accommodative convergence per diopter of accommodation. Abnormal AC/A ratios can cause strabismus. There are several methods described for measuring the AC/A ratio clinically, including the heterophoria, gradient, and graphical methods. The document outlines treatments for different AC/A ratio abnormalities like convergence excess, convergence insufficiency, divergence excess, and divergence insufficiency.
This document discusses retinal correspondence and abnormal retinal correspondence. It defines retinal correspondence as the relationship between paired retinal visual cells in the two eyes that allows for single binocular vision. Abnormal retinal correspondence occurs when the fovea of one eye corresponds to an extrafoveal area in the other eye, resulting in eccentric fixation but maintained binocular vision. The document describes tests to assess normal versus abnormal retinal correspondence, including the Bagolini striated glasses test, red filter test, and Hering-Bielschowsky after-image test.
This document discusses electrophysiological tests of the visual system, including electroretinography (ERG), electrooculography (EOG), and visually evoked potentials (VEP). It provides details on:
- The technique, components, and clinical applications of ERG for evaluating retinal function
- The technique and interpretation of EOG for assessing the retinal pigment epithelium
- The types (flash vs pattern stimulation) and clinical utility of VEP for objectively evaluating visual pathways beyond the retina
- Prisms can be used for relieving, correcting, overcorrecting, inversing, yoking, rotating, and regionally.
- Relieving prism reduces the demand on vergence systems for patients with normal fusion. Correcting prism optically eliminates the deviation. Overcorrecting or inversing prisms are used to disrupt abnormal retinal correspondence.
- Consider a patient's retinal correspondence and presence of suppression when choosing a prism type. Rotating or disruptive prisms can help break down abnormal retinal correspondence.
Correction of Ametropia is very basic topic in Optometry background. Hope the SlideShare may help you. This PPT will help Bachelor students (B.optoms).
The document provides an overview of the slit lamp biomicroscope, a microscope used to examine the eye. It describes the history, development, parts, optics, and various illumination techniques of the slit lamp. The slit lamp allows a magnified three-dimensional view of the eye for documentation and quantitative measurements. Examination with the slit lamp involves using different illumination methods like diffuse, direct, indirect, and retro-illumination to view different structures of the eye. Proper technique and understanding of slit lamp use is important for quality eye examinations.
This 3-sentence summary provides the key details about the protocol:
The protocol describes how to implant a guide cannula in transgenic mice expressing fluorescent proteins to allow insertion of a fiber optic probe for imaging deep brain structures of freely moving mice under anesthesia. The guide cannula is implanted using stereotactic surgery and then a fiber optic probe is inserted through the cannula and lowered to the target brain region under microscope guidance for in vivo imaging of fluorescent cells over multiple time points.
This document discusses measuring and classifying accommodative convergence/accommodation (AC/A) ratios. It defines the AC/A ratio as the change in accommodative convergence per diopter of accommodation. Abnormal AC/A ratios can cause strabismus. There are several methods described for measuring the AC/A ratio clinically, including the heterophoria, gradient, and graphical methods. The document outlines treatments for different AC/A ratio abnormalities like convergence excess, convergence insufficiency, divergence excess, and divergence insufficiency.
This document discusses retinal correspondence and abnormal retinal correspondence. It defines retinal correspondence as the relationship between paired retinal visual cells in the two eyes that allows for single binocular vision. Abnormal retinal correspondence occurs when the fovea of one eye corresponds to an extrafoveal area in the other eye, resulting in eccentric fixation but maintained binocular vision. The document describes tests to assess normal versus abnormal retinal correspondence, including the Bagolini striated glasses test, red filter test, and Hering-Bielschowsky after-image test.
This document discusses electrophysiological tests of the visual system, including electroretinography (ERG), electrooculography (EOG), and visually evoked potentials (VEP). It provides details on:
- The technique, components, and clinical applications of ERG for evaluating retinal function
- The technique and interpretation of EOG for assessing the retinal pigment epithelium
- The types (flash vs pattern stimulation) and clinical utility of VEP for objectively evaluating visual pathways beyond the retina
- Prisms can be used for relieving, correcting, overcorrecting, inversing, yoking, rotating, and regionally.
- Relieving prism reduces the demand on vergence systems for patients with normal fusion. Correcting prism optically eliminates the deviation. Overcorrecting or inversing prisms are used to disrupt abnormal retinal correspondence.
- Consider a patient's retinal correspondence and presence of suppression when choosing a prism type. Rotating or disruptive prisms can help break down abnormal retinal correspondence.
Correction of Ametropia is very basic topic in Optometry background. Hope the SlideShare may help you. This PPT will help Bachelor students (B.optoms).
The document provides an overview of the slit lamp biomicroscope, a microscope used to examine the eye. It describes the history, development, parts, optics, and various illumination techniques of the slit lamp. The slit lamp allows a magnified three-dimensional view of the eye for documentation and quantitative measurements. Examination with the slit lamp involves using different illumination methods like diffuse, direct, indirect, and retro-illumination to view different structures of the eye. Proper technique and understanding of slit lamp use is important for quality eye examinations.
This document discusses various theories and anomalies of accommodation. It begins by defining accommodation and related terms. It then discusses several theories of the accommodation mechanism, including Helmholtz's relaxation theory, Gullstrand's mechanical model, and Schachar's, Tsherning's, and Cotenary's theories. It also covers types of accommodation and anomalies such as presbyopia, insufficiency/ill-sustained accommodation, paralysis, excess accommodation, and spasm. Presbyopia is discussed in detail regarding pathophysiology, causes, symptoms, and treatment options like optical correction and surgery. Other anomalies are summarized briefly regarding their etiology, clinical features, and management.
Various laser lenses have been introduced following Goldmann 3- mirror and Goldmann fundus contact lens for retinal photocoagulation.
Below described some of the time-tested lenses in widespread use. Precise knowledge of these lenses is necessary for safe retinal photocoagulation.
The synoptophore is an instrument used in orthoptics to test binocular vision. It presents different images to each eye to test fusional abilities. The synoptophore was developed in the early 20th century based on the haploscopic principle. It uses mirrors and lenses to direct different images to each eye. Various models have different additional features like afterimage devices, automatic flashing, and measurement of vertical/torsional deviations. A wide range of slides can test functions like stereopsis, fusion, suppression, and retinal correspondence. The synoptophore is useful for both diagnosing binocular vision disorders and providing vergence therapy.
Binocular anomalies refer to disorders of binocular vision that include strabismus, amblyopia, and anomalies of vergence and accommodation. Some common binocular anomalies are esotropia, exotropia, vertical deviations, convergence insufficiency, and accommodative disorders. Causes can include refractive errors, ocular misalignment, neurological issues, or trauma. Symptoms may include diplopia, headaches, asthenopia, or blurred vision. Diagnosis involves assessing ocular alignment, binocular vision functions like stereopsis and suppression, and accommodative and vergence abilities. Treatment depends on the specific anomaly but may involve optical correction, vision therapy, or surgery.
The synaptophore is a device used to measure binocular vision anomalies. It consists of two optical tubes that can be adjusted horizontally, vertically, and torsionally. Various slides are used for diagnostic and treatment purposes to measure deviations, fusion, stereopsis, and retinal correspondence. Key measurements include the objective and subjective angles of deviation in different gazes, as well as the fusional ranges in horizontal, vertical, and torsional planes. Suppression can also be detected and mapped out. Precise adjustments of the tubes allow customized orthoptic treatment of binocular vision disorders.
This document discusses paraxial geometrical optics and relevant issues in refractive surgery. It defines key terms like paraxial rays, marginal rays, apertures, pupils, and optical zones. It describes how centering the ablation on the pupil is important to maximize visual function and minimize aberrations. Decentration of more than 0.1-0.2mm can erase benefits of customized ablation. Clinical cases demonstrate problems that can arise from decentration, including glare, halos, and irregular astigmatism. The take-home message is that the ablation center should be centered on the miotic pupil to optimize outcomes.
The optom faslu muhammed is a haploscopic device used to assess binocular vision. It consists of two tubes mounted on a base with a chin rest and forehead rest. Each tube contains a light source, slide carrier, reflecting mirror, and +6.50D eye piece. It is used to test various grades of binocular vision like simultaneous macular perception, fusion, and stereopsis using different slides. It can also be used to measure the inter-pupillary distance, angle of deviation, and range of fusion.
The slit lamp is an instrument used to examine the eye and adnexa. It consists of a binocular microscope combined with a light source that provides illumination in the form of an adjustable narrow slit. This allows for stereoscopic examination of the external eye structures at high magnification. The slit lamp utilizes various optical configurations and illumination techniques to evaluate the different layers and structures of the anterior segment of the eye. It is an essential tool in ophthalmic examination and diagnosis.
This document discusses the evaluation of strabismus. It begins by classifying strabismus and describing the axes of the eye. It then discusses the goals of a strabismus examination, which include establishing a cause, diagnosing amblyopia, measuring deviation, and assessing binocular sensory status. The document outlines various tests used in the sensory and motor evaluation of strabismus, including visual acuity tests, cover tests, versions and duction tests, and tests of stereopsis. It provides details on classifying deviations, measuring deviations, and evaluating binocular vision and sensory responses.
This document discusses binocular vision and its development. It covers the following key points in 3 sentences:
The prerequisites for developing binocular vision include proper fixation with each eye, fusional eye movements, similar images formed on each retina, and overlapping visual fields between the two eyes. Binocular vision develops through sensory, motor, and central mechanisms, with the sensory mechanism relying on visual acuity, retinal correspondence, and proprioceptive impulses. Tests are used to assess the grades of binocular vision achieved through the coordinated use of both eyes to perceive a single mental image despite separate retinal images.
Glare testing and dark adaptation assessment are important for evaluating ocular conditions that impact vision in low light or with glare. Glare refers to discomfort or reduced vision caused by excessive brightness in the visual field. There are several types of glare and various instruments to test for its effects. Dark adaptation measures the eye's recovery of sensitivity in low light over time and provides information about rod and cone function. Factors like pre-adaptation light levels and stimulus properties influence the dark adaptation curve. Abnormal curves may indicate conditions affecting the outer retina or retinal pigment epithelium. Management can include absorptive glasses worn before bright light exposure.
Binocular vision involves the coordinated use of both eyes to perceive a single image. It normally develops fully by age 4 and allows for fusion, stereopsis, and simultaneous perception. The development of binocular vision is dependent on normal visual experience during the first decade of life; abnormal visual experience can lead to poor or no binocular vision. Understanding the mechanism of binocular vision, including retinal correspondence and fusion, is important for diagnosing and treating abnormalities in binocular vision.
Refraction and optical management of strabismus patientsboomback
1. This document discusses refraction and optical management techniques for patients with strabismus. It outlines refraction techniques, options for optical management including spectacles, contact lenses, and prisms, and how to approach specific types of strabismus like infantile esotropia and accommodative esotropia.
2. For accommodative esotropia, the document recommends initially prescribing full cycloplegic correction and considering bifocal spectacles if a residual deviation remains. It provides guidance on bifocal segment height and power. Prisms can also be used to relieve residual deviations.
3. For intermittent exotropia, the
Optometry instruments is a presentation to describe instrument in a beautiful way. use this tool to improve your knowledge. stay blessed. Regards Muhammad Akbar Rashid Qadri.
This document discusses measurement of fusion and stereopsis in binocular vision. It begins by defining binocular vision and binocular single vision. It then discusses various classifications, prerequisites, advantages, and related terms of binocular single vision. The document also describes different tests used to measure fusion, including the synaptophore, prism fusion test, Worth's four dot test, Bagolini's striated glass test, and Maddox rod test. It provides details on the procedures and interpretations of these tests. Finally, it discusses the development and grades of binocular vision.
Introduction to accommodative and binocular anomaliesHammed Sherifdeen
This document discusses accommodation and binocular anomalies. It defines accommodation as the eye's ability to change optical power to focus on objects at different distances. The components involved are the ciliary muscle, crystalline lens, zonules, and vitreous. Accommodation is stimulated by increasing object vergence through proximity or minus lenses. The amplitude of accommodation is the eye's total focusing range, measured using the RAF rule by finding the near point where a target first blurs and becomes clear again. It declines with age from about 14D at age 10 to 0.5D at age 60.
This document discusses the history and principles of autorefractors. It explains that autorefractors use infrared light and meridional refractometry to objectively determine a patient's refractive error without needing subjective feedback. Modern autorefractors are more accurate and efficient than older subjective methods due to advances in electronics. They work by projecting an infrared fixation target and using a Badal optometer and fogging technique to relax accommodation and obtain refractive measurements.
Gonioscopy: gonioscopic lenses, principle and clinical aspectsDr Samarth Mishra
This document discusses gonioscopy, which is used to examine the anterior chamber angle. It begins by explaining that the angle cannot be viewed directly due to total internal reflection at the cornea. Gonioscopic lenses eliminate this effect by matching the cornea's refractive index. There are two main types of lenses - indirect lenses use mirrors and direct lenses refract light. The document then describes various gonioscopic lenses and techniques like indentation gonioscopy. It outlines the clinical uses of gonioscopy and provides examples of gonioscopic findings. In summary, the document provides an in-depth overview of gonioscopy equipment, techniques, and applications.
This document provides an overview of cephalometric radiography. It defines cephalometrics as the measurement of the head from radiographic images. It describes the basic components and techniques of traditional cephalometric radiography using film, as well as newer digital equipment. The document outlines the main radiographic projections used, including the true lateral cephalometric and outlines some of the key anatomical points that are traced and measured in a cephalometric analysis.
Lt0520 d peek bio-pushlock knotless anchor for bankart repairdrnaula
1. The document describes the surgical technique for using the PushLock knotless suture anchor to repair Bankart lesions and SLAP tears of the shoulder.
2. The technique involves passing sutures through the capsulolabral tissue and labrum using various suture-passing devices, threading the sutures through the PushLock anchor, and tapping the anchor into place to reattach the tissue to the glenoid bone.
3. Additional steps are described for repairing SLAP tears, including passing sutures through the superior labrum and placing anchors in the posterosuperior glenoid.
This document discusses various theories and anomalies of accommodation. It begins by defining accommodation and related terms. It then discusses several theories of the accommodation mechanism, including Helmholtz's relaxation theory, Gullstrand's mechanical model, and Schachar's, Tsherning's, and Cotenary's theories. It also covers types of accommodation and anomalies such as presbyopia, insufficiency/ill-sustained accommodation, paralysis, excess accommodation, and spasm. Presbyopia is discussed in detail regarding pathophysiology, causes, symptoms, and treatment options like optical correction and surgery. Other anomalies are summarized briefly regarding their etiology, clinical features, and management.
Various laser lenses have been introduced following Goldmann 3- mirror and Goldmann fundus contact lens for retinal photocoagulation.
Below described some of the time-tested lenses in widespread use. Precise knowledge of these lenses is necessary for safe retinal photocoagulation.
The synoptophore is an instrument used in orthoptics to test binocular vision. It presents different images to each eye to test fusional abilities. The synoptophore was developed in the early 20th century based on the haploscopic principle. It uses mirrors and lenses to direct different images to each eye. Various models have different additional features like afterimage devices, automatic flashing, and measurement of vertical/torsional deviations. A wide range of slides can test functions like stereopsis, fusion, suppression, and retinal correspondence. The synoptophore is useful for both diagnosing binocular vision disorders and providing vergence therapy.
Binocular anomalies refer to disorders of binocular vision that include strabismus, amblyopia, and anomalies of vergence and accommodation. Some common binocular anomalies are esotropia, exotropia, vertical deviations, convergence insufficiency, and accommodative disorders. Causes can include refractive errors, ocular misalignment, neurological issues, or trauma. Symptoms may include diplopia, headaches, asthenopia, or blurred vision. Diagnosis involves assessing ocular alignment, binocular vision functions like stereopsis and suppression, and accommodative and vergence abilities. Treatment depends on the specific anomaly but may involve optical correction, vision therapy, or surgery.
The synaptophore is a device used to measure binocular vision anomalies. It consists of two optical tubes that can be adjusted horizontally, vertically, and torsionally. Various slides are used for diagnostic and treatment purposes to measure deviations, fusion, stereopsis, and retinal correspondence. Key measurements include the objective and subjective angles of deviation in different gazes, as well as the fusional ranges in horizontal, vertical, and torsional planes. Suppression can also be detected and mapped out. Precise adjustments of the tubes allow customized orthoptic treatment of binocular vision disorders.
This document discusses paraxial geometrical optics and relevant issues in refractive surgery. It defines key terms like paraxial rays, marginal rays, apertures, pupils, and optical zones. It describes how centering the ablation on the pupil is important to maximize visual function and minimize aberrations. Decentration of more than 0.1-0.2mm can erase benefits of customized ablation. Clinical cases demonstrate problems that can arise from decentration, including glare, halos, and irregular astigmatism. The take-home message is that the ablation center should be centered on the miotic pupil to optimize outcomes.
The optom faslu muhammed is a haploscopic device used to assess binocular vision. It consists of two tubes mounted on a base with a chin rest and forehead rest. Each tube contains a light source, slide carrier, reflecting mirror, and +6.50D eye piece. It is used to test various grades of binocular vision like simultaneous macular perception, fusion, and stereopsis using different slides. It can also be used to measure the inter-pupillary distance, angle of deviation, and range of fusion.
The slit lamp is an instrument used to examine the eye and adnexa. It consists of a binocular microscope combined with a light source that provides illumination in the form of an adjustable narrow slit. This allows for stereoscopic examination of the external eye structures at high magnification. The slit lamp utilizes various optical configurations and illumination techniques to evaluate the different layers and structures of the anterior segment of the eye. It is an essential tool in ophthalmic examination and diagnosis.
This document discusses the evaluation of strabismus. It begins by classifying strabismus and describing the axes of the eye. It then discusses the goals of a strabismus examination, which include establishing a cause, diagnosing amblyopia, measuring deviation, and assessing binocular sensory status. The document outlines various tests used in the sensory and motor evaluation of strabismus, including visual acuity tests, cover tests, versions and duction tests, and tests of stereopsis. It provides details on classifying deviations, measuring deviations, and evaluating binocular vision and sensory responses.
This document discusses binocular vision and its development. It covers the following key points in 3 sentences:
The prerequisites for developing binocular vision include proper fixation with each eye, fusional eye movements, similar images formed on each retina, and overlapping visual fields between the two eyes. Binocular vision develops through sensory, motor, and central mechanisms, with the sensory mechanism relying on visual acuity, retinal correspondence, and proprioceptive impulses. Tests are used to assess the grades of binocular vision achieved through the coordinated use of both eyes to perceive a single mental image despite separate retinal images.
Glare testing and dark adaptation assessment are important for evaluating ocular conditions that impact vision in low light or with glare. Glare refers to discomfort or reduced vision caused by excessive brightness in the visual field. There are several types of glare and various instruments to test for its effects. Dark adaptation measures the eye's recovery of sensitivity in low light over time and provides information about rod and cone function. Factors like pre-adaptation light levels and stimulus properties influence the dark adaptation curve. Abnormal curves may indicate conditions affecting the outer retina or retinal pigment epithelium. Management can include absorptive glasses worn before bright light exposure.
Binocular vision involves the coordinated use of both eyes to perceive a single image. It normally develops fully by age 4 and allows for fusion, stereopsis, and simultaneous perception. The development of binocular vision is dependent on normal visual experience during the first decade of life; abnormal visual experience can lead to poor or no binocular vision. Understanding the mechanism of binocular vision, including retinal correspondence and fusion, is important for diagnosing and treating abnormalities in binocular vision.
Refraction and optical management of strabismus patientsboomback
1. This document discusses refraction and optical management techniques for patients with strabismus. It outlines refraction techniques, options for optical management including spectacles, contact lenses, and prisms, and how to approach specific types of strabismus like infantile esotropia and accommodative esotropia.
2. For accommodative esotropia, the document recommends initially prescribing full cycloplegic correction and considering bifocal spectacles if a residual deviation remains. It provides guidance on bifocal segment height and power. Prisms can also be used to relieve residual deviations.
3. For intermittent exotropia, the
Optometry instruments is a presentation to describe instrument in a beautiful way. use this tool to improve your knowledge. stay blessed. Regards Muhammad Akbar Rashid Qadri.
This document discusses measurement of fusion and stereopsis in binocular vision. It begins by defining binocular vision and binocular single vision. It then discusses various classifications, prerequisites, advantages, and related terms of binocular single vision. The document also describes different tests used to measure fusion, including the synaptophore, prism fusion test, Worth's four dot test, Bagolini's striated glass test, and Maddox rod test. It provides details on the procedures and interpretations of these tests. Finally, it discusses the development and grades of binocular vision.
Introduction to accommodative and binocular anomaliesHammed Sherifdeen
This document discusses accommodation and binocular anomalies. It defines accommodation as the eye's ability to change optical power to focus on objects at different distances. The components involved are the ciliary muscle, crystalline lens, zonules, and vitreous. Accommodation is stimulated by increasing object vergence through proximity or minus lenses. The amplitude of accommodation is the eye's total focusing range, measured using the RAF rule by finding the near point where a target first blurs and becomes clear again. It declines with age from about 14D at age 10 to 0.5D at age 60.
This document discusses the history and principles of autorefractors. It explains that autorefractors use infrared light and meridional refractometry to objectively determine a patient's refractive error without needing subjective feedback. Modern autorefractors are more accurate and efficient than older subjective methods due to advances in electronics. They work by projecting an infrared fixation target and using a Badal optometer and fogging technique to relax accommodation and obtain refractive measurements.
Gonioscopy: gonioscopic lenses, principle and clinical aspectsDr Samarth Mishra
This document discusses gonioscopy, which is used to examine the anterior chamber angle. It begins by explaining that the angle cannot be viewed directly due to total internal reflection at the cornea. Gonioscopic lenses eliminate this effect by matching the cornea's refractive index. There are two main types of lenses - indirect lenses use mirrors and direct lenses refract light. The document then describes various gonioscopic lenses and techniques like indentation gonioscopy. It outlines the clinical uses of gonioscopy and provides examples of gonioscopic findings. In summary, the document provides an in-depth overview of gonioscopy equipment, techniques, and applications.
This document provides an overview of cephalometric radiography. It defines cephalometrics as the measurement of the head from radiographic images. It describes the basic components and techniques of traditional cephalometric radiography using film, as well as newer digital equipment. The document outlines the main radiographic projections used, including the true lateral cephalometric and outlines some of the key anatomical points that are traced and measured in a cephalometric analysis.
Lt0520 d peek bio-pushlock knotless anchor for bankart repairdrnaula
1. The document describes the surgical technique for using the PushLock knotless suture anchor to repair Bankart lesions and SLAP tears of the shoulder.
2. The technique involves passing sutures through the capsulolabral tissue and labrum using various suture-passing devices, threading the sutures through the PushLock anchor, and tapping the anchor into place to reattach the tissue to the glenoid bone.
3. Additional steps are described for repairing SLAP tears, including passing sutures through the superior labrum and placing anchors in the posterosuperior glenoid.
This document discusses biometry techniques used to measure eye dimensions needed for intraocular lens (IOL) power calculations during cataract surgery. It describes keratometry to measure corneal curvature, A-scan ultrasound to measure axial length, and various IOL formulas used to calculate the needed IOL power based on the measured parameters. Key biometry techniques discussed include keratometry, A-scan ultrasound, optical biometers like the IOL Master and Lens Star, and common IOL formulas like SRK/T.
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Cephalometrics in orthodontics /certified fixed orthodontic courses by India...Indian dental academy
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients
This document provides information about cephalometry and lateral cephalometric radiography. It discusses the history of cephalometry from its origins in craniometry to its modern use of x-rays and lateral head films. The document outlines the standard equipment used in cephalometry including x-ray machines, cephalostats to position the head, and films. It also describes techniques for tracing cephalograms including landmarks, reference lines and angles. Different methods of cephalometric analysis are classified including those based on angles, distances, norms, and areas of analysis like dentoskeletal or soft tissues. Downs analysis is discussed as an example using angular and linear measurements to define normal skeletal and dental patterns.
Keratometry is used to measure the curvature of the cornea. It works by reflecting light off the cornea and measuring the size of the reflected image. Dynamic retinoscopy objectively determines the refractive state of the eye when it is accommodating to view a near target. It provides information about the eye's accommodative response and ability to focus at near. Dynamic retinoscopy techniques include MEM, Nott retinoscopy, and Bell retinoscopy which use different targets and methods to evaluate accommodation.
1) The document discusses preliminary studies using two-photon microscopy to image brain areas of zebra finches through their thin skin and hollow skull structure for non-invasive monitoring of brain activity.
2) Experiments were conducted imaging hollow fibers filled with Rhodamine B passed through fixed zebra finch skin and skull samples to evaluate spatial resolution and distortion. Reflectance confocal measurements were also taken to determine scattering properties of fresh and fixed skin and skull.
3) The goal is to determine if two-photon microscopy can provide sufficient resolution for in vivo brain imaging and metabolism monitoring of zebra finches as a model for studying vocal recognition, without requiring craniotomy as in other small animal studies.
1) Parotidectomy involves surgically removing all or part of the parotid gland located in front of and below the ear.
2) The procedure begins by making incisions and developing skin flaps to expose the gland. The facial nerve is then identified, either at its main trunk or branches.
3) Dissection then proceeds along the plane of the facial nerve to remove portions of the gland while preserving the nerve branches. Hemostasis is achieved and any duct divisions are managed. Deep lobe tumors require additional care near the nerve.
A Classroom presentation, showing the various types of slit-lamps, their parts, and other accessory instruments that can be used with it for enhanced optometric clinical examination.
1. Biometry is the process of measuring the eye to determine the ideal intraocular lens power for cataract surgery. This involves measuring the corneal power with keratometry and the axial length of the eye.
2. A-scan ultrasound biometry and IOL Master are commonly used techniques to measure axial length. A-scan uses ultrasound waves while IOL Master uses optical low-coherence interferometry. Factors like media opacity, posterior staphyloma, and macular pathology can make measurements difficult.
3. Keratometry is used to measure corneal curvature based on reflected images. It provides objective data on corneal astigmatism and power which is important for IOL power calculation and contact
1) Biometry is the process of measuring the eye to determine the ideal intraocular lens power for cataract surgery. It involves measuring the corneal power and axial length of the eye.
2) Traditional A-scan ultrasound biometry measures axial length using sound waves, but has limitations like variable corneal compression. Newer devices like the IOL Master use optical interferometry and are non-contact.
3) Proper technique and accounting for factors like intraocular lens material are important for accurate biometry and intraocular lens power calculation. Inaccuracies can result in postoperative refractive surprises.
Intraocular Lens (IOL) power calculation is a crucial step in cataract surgery and certain refractive surgeries like phakic IOL implantation. The goal is to determine the appropriate power of the IOL to be implanted into the eye, ensuring that the patient achieves their desired postoperative visual outcome. Several formulas and methods are available for IOL power calculation, and the choice of formula depends on various factors, including the patient's eye measurements and the surgeon's preference. Here, we describe the basic principles and some commonly used formulas.
Ocular Biometry:
Ocular biometry is the process of measuring various dimensions of the eye, primarily the axial length, corneal power, and anterior chamber depth. These measurements are essential for accurate IOL power calculation and achieving the desired post-surgical refractive outcome. Here are the key components of ocular biometry:
Axial Length: This measurement determines the overall length of the eye, from the cornea's front surface to the retina's back surface. Axial length is a critical factor in IOL power calculation because it helps determine the eye's focusing power.
Corneal Power: The cornea is the transparent front surface of the eye, and its curvature affects the eye's refractive power. Corneal power is typically measured using techniques like keratometry or corneal topography. It helps account for the eye's astigmatism and assists in selecting the appropriate IOL.
some basic notions on how they are measured is explored here.
Extraoral radiography involves placing the x-ray source and film outside the patient's mouth. It is useful for evaluating large areas of the skull and jaws. The document discusses the history and techniques of various extraoral projections including lateral skull, submentovertex, Waters, and panoramic views. Exposure parameters, indications, and anatomical structures visualized are provided for each projection. Limitations of extraoral radiography include reduced detail and contrast compared to intraoral films. Knowledge of different techniques helps make accurate diagnoses while minimizing radiation exposure.
The document describes the surgical technique for stabilizing an acromioclavicular joint dislocation using the AC GraftRope system. Key steps include: 1) Preparing an allograft or autograft tendon graft; 2) Drilling tunnels through the clavicle and coracoid process; 3) Passing the graft attached to a coracoid button through the tunnels; 4) Reducing the clavicle and securing it with the button, graft, and washer; and 5) Fixing the graft to the clavicle with a screw. The procedure can be performed arthroscopically or open surgically.
This document provides an overview of cephalometrics and its history. It discusses how cephalometrics is used to measure and analyze the skull. It outlines the typical radiographic technique used, including positioning the patient and capturing lateral cephalograms. The document identifies numerous craniofacial landmarks that are measured and analyzed, as well as common reference lines and planes used in cephalometric analysis. It also discusses the importance of standardizing the cephalometric technique and measurements.
Place the securement ring over the mesh arm and tubular introducer.
Surgeon: Slide the securement ring down until it locks into place over the mesh arm and introducer.
A myelogram is a radiographic procedure where contrast medium is injected into the spinal subarachnoid space to evaluate the spinal cord, nerve roots, and spinal canal for abnormalities. It is performed by a radiologist under fluoroscopy guidance and involves inserting a needle into the lumbar or cervical spine to inject contrast medium. Images are then taken under fluoroscopy and with conventional radiography in multiple positions to visualize the entire spinal canal and assess for any structural abnormalities. Patients are monitored after the procedure and advised on post-procedure care depending on the type of contrast medium used.
Similar to Protocol: Imaging the Deep Brain of Freely Moving Mice (20)
This document describes a high resolution multi-modal imaging platform that combines ultrasound and photoacoustics. It provides anatomical, functional, and molecular data with superior resolution down to 30 μm. The system has a customizable touchscreen interface and is compact and portable. It can be used for applications in neurobiology, molecular biology, cardiology, and oncology to assess vascularity, perfusion, biomarkers, and response to therapy.
Vevo 3100 - The ultimate preclinical imaging experience. The Vevo 3100 is a new and innovative platform created for the future of imaging. It combines ultra high frequency ultrasound imaging, quantification and education in a convenient all-in-one touchscreen platform.
This document provides a bibliography of top cardiovascular research papers organized by topic. The topics covered include abdominal aortic aneurysm, atherosclerosis, cardiac hypertrophy, cardiac injection, cardiomyopathy, chick embryo, contrast, developmental cardiology, diastolic dysfunction, graft transplantation, Holt-Oram syndrome, Marfan syndrome, myocardial infarction, pulmonary hypertension, rabbit cardiovascular, rat cardiovascular, stem cells, stress echocardiography, and valvular flow & function. For each topic, several of the most influential papers from 2009-2010 are listed with their citation information.
This document provides a bibliography of research papers related to cancer organized by topic. It includes 3-7 references for each of 17 cancer-related topics, such as 3D tumor imaging, angiogenesis, bladder cancer, breast cancer, contrast imaging, and others. The references provided for each topic are journal articles published between 2005-2010 that describe research on imaging, molecular markers, treatment responses, and other aspects of various cancers.
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Protocol: Imaging the Deep Brain of Freely Moving Mice
1. Protocol
Imaging the Deep Brain of
Freely Moving Mice
Ver 1.0
2. Imaging the Deep Brain of Freely Moving Mice
Materials and Methods
Mouse Model Adult wildtype mouse
Fluorophore/Marker Oregon green BAPTA 1 AM
Equipment
Cellvizio® LAB 488
ImageCellTM software
QuantiKitTM 488 calibration kit
NeuroPakTM
Laboratory material
Anesthesia and appropriate delivery Betadine
method (i.e. vaporizer or syringe) Topical analgesic
Topical antibiotic
Hair clippers Scalpel
Gauze Surgical scissors
PBS or 0.9% NaCl Forceps
Anesthetic (gas or solution) Stereotaxic brain atlas
Dissecting microscope Stereotactic frame (for mouse) with electrode and
implant holders
Ice Ear bars
70% ethanol solution Needle
Oregon Green BAPTA 1 solution Drilling tool (with small drill bits: 0.25mm – 0.5mm)
Precision pump
36 G tube (5 cm) Dental cement/acrylic
Hamilton syringe (5 or 10
microliters)
Tubing 0.011” x 0.24” x 0.0065” Lead pencil
Krazy glue Bone wax
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 1
3. Protocol
Step 1: Implantation of guide-cannula (Day 1)
NOTE: See also Appendix I for visual instructions
1. Anesthetize the mouse according to the method of the lab. Pinch the hind foot - the
mouse is ready when it is not responsive.
2. Clean all surgical instruments with 70% ethanol solution to disinfect.
3. Shave the head to expose skin.
4. Fix the mouse head into the stereotaxic frame with ear bars and bite plate. Ensure
that the animal is breathing normally.
5. Make a longitudinal incision in the middle of the head with scalpel or scissors to
expose Lambda, Bregma, and the approximate X,Y position of the target structure.
Clean the skull with PBS or 0.9% NaCl. Wipe with betadine and 70% alcohol.
Depending on your facility, add topical analgesic and/or topical antibiotic.
6. Under a dissecting microscope, use forceps to apply pressure and ensure that the
skull remains immobile. Identify anatomical landmarks Lambda (caudal aspect) and
Bregma (frontal aspect). Mark them with the lead pencil. Refer to Appendix I for
visual instructions.
7. Use the drilling tool to make 3 holes for the anchorage microscrews contralateral to
the image target. The diameter of the holes should be adapted to the size of the
screws. To ensure stability of the guide-cannula, one microscrew should be fixed in
the frontal bone as far away as possible from Bregma, one in the parietal bone, and
one on the occipital bone. Allow the top of the microscrews to remain above the
skull: they will better serve as anchorage points if dental cement can be put all
around them. Refer to Appendix I for visual instructions.
Tip: Gently blow bone dust away rather than wiping it away with a damp piece of gauze.
Positioning of the skull
1. Fix a needle onto the electrode holder of the stereotactic frame. Move the tip of the
needle using the micromanipulators of the stereotaxic frame to ensure that Bregma
and Lambda are aligned along the X, Y axis. If they are not aligned, reposition the
skull using the ear bar micromanipulators until these points are perfectly aligned.
Similarly, note the Z positions of Lambda and Bregma and reposition the skull using
the ear bar and bite plate micromanipulators until the Z coordinates are the same.
2. Move 1mm away from Lambda on each side. Note the Z for these two points. Adjust
skull position to get these points at the same level. This procedure aims to ensure
that the skull is perfectly placed, a need to perform a good probe placement.
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 2
4. 3. Reposition the needle tip at Bregma and note its position by placing the tip of the
needle exactly on this point. Note all coordinates for this point (X, Y, Z). This is the
reference point (0, 0, 0).
4. Use the brain atlas to determine the appropriate coordinates of the structure that
you want to reach, according to Bregma. Use the coordinates to calculate the target
position (X, Y). Using the micromanipulators of the stereotaxic frame, move the tip
of the needle to reach this point. Mark the skull with the pencil on this precise
location.
5. Use the drilling tool to make a hole in the marked location. A hole at least 1,250µm
in diameter is required to allow insertion of the guide-cannula.
Tip: If a blood vessel is damaged and blood begins to leak, use dry gauze to absorb the
blood and rinse with ice-cold PBS or 0.9% NaCl.
6. Use a standard 25 G needle or pointed forceps to punch through and remove the
meninges. This will facilitate insertion of the dedicated implant.
7. Fix a guide-cannula implant onto the dedicated implant holder provided in the
NeuroPakTM kit. Exchange the stereotaxic electrode holder with the dedicated implant
holder and rotate such that the implant is 45 degrees from the midline as described
on the following diagrams.
Schematic representation of skull and
implant for insertion of guide cannula within
the left hemisphere
Schematic representation of skull and
implant for insertion of guide cannula within
the right hemisphere
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 3
5. Lateral view of the implant turned
45 degrees away from the midline
(implantation on the left side).
Note that the bevel allows
visualization of the guide-cannula
as it enters the predrilled hole
during implantation.
The guide-cannula of the implant is
represented in blue, while the red
dot represents the anchor column
to which the CerboFlex™ will be
secured.
8. Using the micromanipulators on the stereotaxic frame, position the center of the
guide-cannula above Bregma. Note the X, Y and Z0 positions. This is the new
reference coordinate (0,0,0). Using the micromanipulators on the stereotaxic frame,
place the guide-cannula in the X and Y positions according to the stereotaxic atlas,
above the image target (should be centered in the hole previously done).
9. Place the guide-cannula directly onto the brain. Note the Z1 position.
10. Insert the guide-cannula into the brain. For subcortical areas, insert the tube 300
micrometers below the brain surface. For deeper brain areas, insert the tube deeper
below the brain surface (600 micrometers) Note the final position Z2. Knowing Z0
for Bregma and final Z2 position allows precise calculation of the depth of
implantation within the brain from Bregma (= distance of the exit part of the cannula
from Bregma).
11. This point will be used later to reach the target with precision.
12. Apply a small amount of bone wax on the underside of the implant around the base
of the guide-cannula to avoid bleeding and prevent dental cement from entering the
guide-cannula.
Note: This step is not required but it should also help to prevent brain infection by closing
the hole around the cannula.
Prepare the dental cement
(as described in the preparation guide, follow the safety instructions).
1. Begin by adding small amounts of dental cement. Begin by the screws then, as the
cement begins to polymerize, finish by the immediate periphery of the cannula and
include the implant. Be very careful to avoid blockage of the guide-cannula with
cement (It should not be of concern if the end of the guide-cannula is inserted
correctly into the brain). Allow the cement dry for 10 minutes.
NOTE: Avoid contact between the skin/fur and the dental cement.
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 4
6. 2. Once the cement has hardened, disconnect the guide-cannula implant from the
implant holder.
3. Insert the anti-contamination plug into the guide-cannula to prevent infection.
Suture the skin around the base of the implanted guide-cannula.
4. Remove the animal from the stereotaxic frame and allow the animal to recover from
the surgery for at least one week prior to imaging. Follow guidelines from your
institution for post operative animal care (use of analgesics, antibiotics, etc.).
Step 2: Dye injection
(Day 7)
Note: This protocol describes the use of Oregon Green BAPTA 1 AM, but other 488nm
excitable dyes can be used with minimal modification to the protocol.
Note: This protocol is also appropriate for 660nm excitable dyes however a Cellvizio LAB
660 system is required.
Dye preparation:
Reference: Stosiek C et al. (2003)
Use one vial of OGB 488 BAPTA-1AM (Oregon Green 488 BAPTA AM-1, MW 1258.07 g,
available from Invitrogen #O-6807)
a. Add 4μl of 20% pluronic acid (Invitrogen #P-3000MP) in DMSO
b. Vortex for 3 mins
c. After this step, the color of the solution should be slightly yellow
d. Add 36μL of Ca2+-free ACSF
e. Add 1μL of SR101 (2.5mM or 2mM mixed in ACSF)
f. Vortex for about 3min
g. Sonicate on ice for 5min
h. If dye sits longer than 30min, sonicate again for 5min
i. Pipette dye into centrifuge filter (Ultrafree MC, available from Fisher Scientific;
UFC30GV25)
j. Centrifuge for 30 sec
k. Dilute 1: 10 in a solution containing (in mM): 150 NaCl, 2.5 KCl, 10 Hepes, pH 7.4.
l. The final solution concentration is 1mM
m. Fill pipette with approximately 8μl
Practically – add 3.97 microliters of DMSO pluronic corresponding to a 10 mM solution) in a
vial of OGB1AM and dilute the solution in 35.7 microliters of Hepes solution to obtain a 1mM
solution
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 5
7. Injection needle preparation
1. Cut a 20 cm long piece of tubing and glue it onto the 36 Gauge needle. Fix the other
extremity of the tubing onto the needle of the Hamilton syringe.
2. Anesthetize the animal using inhaled or injected anesthetic. Inhaled anesthetic is
preferred as it provides continuous anesthesia, however if this is not possible, adjust
the dose so that it provides approximately 90min of immobilization.
3. Remove the anti-contamination plug from the guide-cannula.
4. Position and secure the animal within the stereotaxic frame (see positioning of the
skull, above). Ensure that the skull is flat and that the guide cannula is parallel to the
descending stereotaxic arm.
5. Clean the tip of the needle with 70% EtOH.
6. Secure the injection needle and tubing onto the descending arm of the stereotaxic
frame perpendicular to the lateral arm of the stereotaxic frame using the electrode
holder. Using the micromanipulators of the stereotaxic frame, position the tip of the
needle on the rim of the guide-cannula opening. Repeat this step for a point on the
opposite side of the rim. Verify that the Z position is the same for both points; adjust
if necessary. This step ensures that the guide-cannula is truly parallel with the length
of the needle.
7. Use the brain atlas to determine the appropriate Z coordinates of the target structure
according to Bregma.
8. Center the injection needle within the guide-cannula. Slowly lower the needle until it
reaches the level of the entrance of the tube. Note the Z3 position.
9. Knowing that the guide-cannula is 7.5 mm long and that the end of the tube is
inserted 300 or 600 micrometers into the brain, calculate how far away from the
entrance of the cannula the injection needle should be lowered to reach the targeted
cells (Calculation: 7.5 mm + distance of target from base of the cannula)
10. Fill the injection needle and the tubing with the dye. Lower the needle to the
appropriate location. Set up the perfusion pump according to manufacturer’s
directions to deliver one microliter over the course of 10 minutes (0.1 μl/minute) and
inject the dye. To allow appropriate diffusion of the dye, do not remove the needle
for 10 minutes following dye delivery. Retraction should be incremental over a 5
minute period. Use caution when removing the needle from the guide-cannula of the
implant. Following retraction, wait at least one hour prior to imaging to ensure that
appropriate cell loading is achieved.
11. Replace the needle and tubing with the fiberoptic CerboFlex™ imaging microprobe.
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 6
8. Step 3: In vivo imaging
While waiting for cellular uptake of the injected dye:
1. Turn on the Cellvizio LAB LSU488 imaging system and the connected computer.
Insert and lock the proximal end of the CerboFlex™ into the connector on the LSU.
For detailed instructions regarding the Cellvizio LAB hardware, consult the hardware
user manual.
2. Launch the ImageCell™ program. For detailed instructions regarding the ImageCell™
software, consult the software user manual. Ensure that the CerboFlex™ microprobe
is detected by turning on the laser. If the probe is not detected, remove it from the
LSU, insert the CerboFlex™ installation CD (included in the NeuroPak™ kit) into the
computer and follow the onscreen instructions. Launch ImageCell™ anew and start
the laser to ensure that the microprobe is detected. Turn on the laser and leave it on
for at least 20 minutes immediately prior to the imaging session.
3. Prior to mounting the CerboFlex™ into the electrode holder of the stereotaxic frame,
calibrate the system using the QuantiKit™ 488 calibration kit. Set up the desired
storage folder and prefix for the images to be acquired. Rinse the tip in 70% EtOH
and then rinse with distilled water.
4. Fix the CerboFlex™ into the electrode holder of the stereotaxic frame. Remove the
anti-contamination plug. Carefully align the tip of the CerboFlex™ with the center of
the guide-cannula implant. Ensure that the orientation of both the fiberoptic
microprobe and the guide-cannula are such that both parts will fit together perfectly.
Be very careful to avoid any contact between the tip and the walls of the cannula
(risk of damage). If the parts are not aligned, refer to the ‘positioning of the skull’
section above. Ensure that the Z-lock screw on the CerboFlex™ is sufficiently loose
to allow the CerboFlex™ to fit around the stabilization column of the guide-cannula
implant.
5. Using dissecting microscope and the micromanipulators on the stereotaxic frame,
center the tip of the CerboFlex™ above the entrance to the guide-cannula. Be very
careful to avoid any contact between the tip and the walls of the cannula (risk of
damage). Lower the CerboFlex™ until the tip of the microprobe reaches the entrance
of the tube. Note the Z4 position.
6. Calculate the target position distance from this point (Z4) according to cannula
length and the depth of the cannula base in the brain. The calculation is similar to
the one calculated previously for the dye delivery (7.5mm + the distance of the
target from the base of the cannula).
7. Slowly and incrementally insert the CerboFlex™ through the cannula and into the
brain tissue. If there is any resistance while inserting the CerboFlex™ into the
cannula, Z-lock screw on the CerboFlex™ is sufficiently loose to allow the
CerboFlex™ to fit around the stabilization column of the guide-cannula implant and
ensure that there is nothing blocking the cannula using a needle under stereotaxic
guidance to clean the port. Turn on the laser to guide the CerboFlex™ to the image
target under image guidance.
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 7
9. Tip: The image target may move slightly once reached. Once cells are identified, turn the
laser off and wait 5 minutes to let the tissue to adjust to the probe. If movement is
detected in the field of view, very fine adjustment of the CerboFlex™ in the Z
direction toward brain surface may be helpful.
8. Carefully secure the CerboFlex™ onto the stabilization column by tightening the Z-
lock screw.
Tip: The field of view may have moved slightly when tightening the Z-lock screw. Turn
the laser off and wait 5 minutes. If the field of view changed, adjust the position of
the CerboFlex™. Repeat this process until the field of view remains stable.
9. Remove the animal from the stereotactic frame and allow it to recover from the
anesthetic. Put it in a resting place to recover from anaesthesia or directly within
your experimetal set up. Ensure that the CerboFlex™ does not become twisted by
monitoring the animal and manually manipulating the animal if necessary.
10. From this point, images can be captured continuously or intermittently using time
lapse acquisition according to your needs.
Step 4: Removal of the CerboFlex™
1. At the end of the imaging session, turn off the laser beam.
2. Anaesthetize and position the animal into the stereotactic frame to remove the
CerboFlex™. Use caution and slowly remove the CerboFlex™ using the
micromanipulators of the stereotaxic frame to prevent damage to the probe tip. It is
equally important to use caution when removing the probe as when inserting the
probe.
3. Clean the CerboFlex™ immediately thoroughly using the QuantiKit™ according to
instructions outlined in the user guide.
4. As Oregon Green Bapta 1 AM is neurotoxic, the animal should be sacrificed at the
end of the imaging session.
References
Stosiek C, Garaschuk O, Holthoff K, Konnerth A (2003). Proc Natl Acad Sci USA;
(100):7319-732
Protocol: Imaging the Deep Brain of Freely Moving Mice Page 8