This document summarizes key information about the anatomy and physiology of the human eye. It discusses the main parts of the eye and their functions, including the sclera, choroid, retina, lens, cornea, iris, and extraocular muscles. It also describes the eye's blood supply and innervation, as well as common eye pathologies and vision problems. Imaging modalities for examining the eye, such as x-ray, ultrasound, CT, MRI, are also summarized.
The tear film is a complex mixture of substances secreted from multiple sources on the ocular surface, including the lacrimal gland, the accessory lacrimal glands, the meibomian glands, and the goblet cells.
ocular anatomy fluid system glaucoma lens cataract phototransduction field visual acuity ocular movement errors of refraction light reflex accommodation corneal reflex visual pathway and its lesions
structure of eye ball,eyeball is a specialized sense organ that helps us to understand our environment. It is a sensory unit composed of three parts: receptor, sensory pathway, and a brain center
The main parts of the human eye are The Conjunctiva,
Sclera,Choroid,
Cornea, Iris, Pupil,
Anterior Chamber,
Posterior Chamber, Aqueous humor, Lens, Vitreous humor, Retina,Macula and Optic nerve.
The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ, the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.
The tear film is a complex mixture of substances secreted from multiple sources on the ocular surface, including the lacrimal gland, the accessory lacrimal glands, the meibomian glands, and the goblet cells.
ocular anatomy fluid system glaucoma lens cataract phototransduction field visual acuity ocular movement errors of refraction light reflex accommodation corneal reflex visual pathway and its lesions
structure of eye ball,eyeball is a specialized sense organ that helps us to understand our environment. It is a sensory unit composed of three parts: receptor, sensory pathway, and a brain center
The main parts of the human eye are The Conjunctiva,
Sclera,Choroid,
Cornea, Iris, Pupil,
Anterior Chamber,
Posterior Chamber, Aqueous humor, Lens, Vitreous humor, Retina,Macula and Optic nerve.
The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ, the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.
magnification, It's definition, types, clinical uses, Uses in Optical instruments like microscopes, telescopes, Uses in Optical instruments like direct Ophthalmoscopes, indirect ophthalmoscopes and slit lamps, In low vision
The human eye: is the most valuable and sensitive sense organ and it is a natural optical instrument. The important parts of the eye: Cornea, Iris, Pupil, Eye Lens, Retina.
Power of Accommodation: The ability of the eye to focus objects lying at different distances is called the power of accommodation of the eye.
Least Distance of Distinct Vision Near point: Near point or least distance of distinct vision is the point nearest to the eye at which an object is visible distinctly
The far point of the eye:
Far point of the eye is the maximum distance up to which the normal eye can see things clearly. It is infinity for a normal eye.
The twinkling of a star is due to atmospheric refraction of starlight.
Scattering of light:
When a beam of light falls on an atom, it causes the electron in the atom to vibrate. The vibrating electrons, in turn, re-emit light in all directions. This process is called scattering.
7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for
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1-IT IS A MIDDLE VASCULAR COAT OF EYEBALL.
2-IT MAINLY CONSIST OF THREE PARTS IRIS, CHOROID, CILIARY BODY.
3- CILIARY BODY CAN HOLD THE LENS AND PLAY IMPORTANT ROLE IN ACCOMODATION.
magnification, It's definition, types, clinical uses, Uses in Optical instruments like microscopes, telescopes, Uses in Optical instruments like direct Ophthalmoscopes, indirect ophthalmoscopes and slit lamps, In low vision
The human eye: is the most valuable and sensitive sense organ and it is a natural optical instrument. The important parts of the eye: Cornea, Iris, Pupil, Eye Lens, Retina.
Power of Accommodation: The ability of the eye to focus objects lying at different distances is called the power of accommodation of the eye.
Least Distance of Distinct Vision Near point: Near point or least distance of distinct vision is the point nearest to the eye at which an object is visible distinctly
The far point of the eye:
Far point of the eye is the maximum distance up to which the normal eye can see things clearly. It is infinity for a normal eye.
The twinkling of a star is due to atmospheric refraction of starlight.
Scattering of light:
When a beam of light falls on an atom, it causes the electron in the atom to vibrate. The vibrating electrons, in turn, re-emit light in all directions. This process is called scattering.
7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for
K-12. We also customize the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use.
For more information:
http://www.7active.in
Contact: 040-64501777 / 65864777
9700061777
1-IT IS A MIDDLE VASCULAR COAT OF EYEBALL.
2-IT MAINLY CONSIST OF THREE PARTS IRIS, CHOROID, CILIARY BODY.
3- CILIARY BODY CAN HOLD THE LENS AND PLAY IMPORTANT ROLE IN ACCOMODATION.
A short simplified anatomy of eye. it includes explanation of all 3 layers of eyes, sclera, choroid and retina. Anatomy of cornea, conjunctiva, pupil, lens, iris, ciliary body etc. physiology of vision, its process and photochemical activity of eyes are discussed in detail.
THIS POWER POINT PRESENTATION IS TO GIVE READERS AN OVERVIEW ON THE ANATOMY AND PHYSIOLOGY OF THE EYE: STRUCTURES, FUNCTIONS OF EACH PART OF THE EYE, AS WELL AS THE PHYSIOLOGY ON HOW THE IMAGE IS CAPTURED IN THE EYE AND TRANSLATED BY THE BRAIN IN ORDER TO HAVE THE MEANINGFUL VIEW OF THE IMAGE.
One of the most developed cities of India, the city of Chennai is the capital of Tamilnadu and many people from different parts of India come here to earn their bread and butter. Being a metropolitan, the city is filled with towering building and beaches but the sad part as with almost every Indian city
Leading the Way in Nephrology: Dr. David Greene's Work with Stem Cells for Ki...Dr. David Greene Arizona
As we watch Dr. Greene's continued efforts and research in Arizona, it's clear that stem cell therapy holds a promising key to unlocking new doors in the treatment of kidney disease. With each study and trial, we step closer to a world where kidney disease is no longer a life sentence but a treatable condition, thanks to pioneers like Dr. David Greene.
Health Education on prevention of hypertensionRadhika kulvi
Hypertension is a chronic condition of concern due to its role in the causation of coronary heart diseases. Hypertension is a worldwide epidemic and important risk factor for coronary artery disease, stroke and renal diseases. Blood pressure is the force exerted by the blood against the walls of the blood vessels and is sufficient to maintain tissue perfusion during activity and rest. Hypertension is sustained elevation of BP. In adults, HTN exists when systolic blood pressure is equal to or greater than 140mmHg or diastolic BP is equal to or greater than 90mmHg. The
The dimensions of healthcare quality refer to various attributes or aspects that define the standard of healthcare services. These dimensions are used to evaluate, measure, and improve the quality of care provided to patients. A comprehensive understanding of these dimensions ensures that healthcare systems can address various aspects of patient care effectively and holistically. Dimensions of Healthcare Quality and Performance of care include the following; Appropriateness, Availability, Competence, Continuity, Effectiveness, Efficiency, Efficacy, Prevention, Respect and Care, Safety as well as Timeliness.
CHAPTER 1 SEMESTER V - ROLE OF PEADIATRIC NURSE.pdfSachin Sharma
Pediatric nurses play a vital role in the health and well-being of children. Their responsibilities are wide-ranging, and their objectives can be categorized into several key areas:
1. Direct Patient Care:
Objective: Provide comprehensive and compassionate care to infants, children, and adolescents in various healthcare settings (hospitals, clinics, etc.).
This includes tasks like:
Monitoring vital signs and physical condition.
Administering medications and treatments.
Performing procedures as directed by doctors.
Assisting with daily living activities (bathing, feeding).
Providing emotional support and pain management.
2. Health Promotion and Education:
Objective: Promote healthy behaviors and educate children, families, and communities about preventive healthcare.
This includes tasks like:
Administering vaccinations.
Providing education on nutrition, hygiene, and development.
Offering breastfeeding and childbirth support.
Counseling families on safety and injury prevention.
3. Collaboration and Advocacy:
Objective: Collaborate effectively with doctors, social workers, therapists, and other healthcare professionals to ensure coordinated care for children.
Objective: Advocate for the rights and best interests of their patients, especially when children cannot speak for themselves.
This includes tasks like:
Communicating effectively with healthcare teams.
Identifying and addressing potential risks to child welfare.
Educating families about their child's condition and treatment options.
4. Professional Development and Research:
Objective: Stay up-to-date on the latest advancements in pediatric healthcare through continuing education and research.
Objective: Contribute to improving the quality of care for children by participating in research initiatives.
This includes tasks like:
Attending workshops and conferences on pediatric nursing.
Participating in clinical trials related to child health.
Implementing evidence-based practices into their daily routines.
By fulfilling these objectives, pediatric nurses play a crucial role in ensuring the optimal health and well-being of children throughout all stages of their development.
Defecation
Normal defecation begins with movement in the left colon, moving stool toward the anus. When stool reaches the rectum, the distention causes relaxation of the internal sphincter and an awareness of the need to defecate. At the time of defecation, the external sphincter relaxes, and abdominal muscles contract, increasing intrarectal pressure and forcing the stool out
The Valsalva maneuver exerts pressure to expel faeces through a voluntary contraction of the abdominal muscles while maintaining forced expiration against a closed airway. Patients with cardiovascular disease, glaucoma, increased intracranial pressure, or a new surgical wound are at greater risk for cardiac dysrhythmias and elevated blood pressure with the Valsalva maneuver and need to avoid straining to pass the stool.
Normal defecation is painless, resulting in passage of soft, formed stool
CONSTIPATION
Constipation is a symptom, not a disease. Improper diet, reduced fluid intake, lack of exercise, and certain medications can cause constipation. For example, patients receiving opiates for pain after surgery often require a stool softener or laxative to prevent constipation. The signs of constipation include infrequent bowel movements (less than every 3 days), difficulty passing stools, excessive straining, inability to defecate at will, and hard feaces
IMPACTION
Fecal impaction results from unrelieved constipation. It is a collection of hardened feces wedged in the rectum that a person cannot expel. In cases of severe impaction the mass extends up into the sigmoid colon.
DIARRHEA
Diarrhea is an increase in the number of stools and the passage of liquid, unformed feces. It is associated with disorders affecting digestion, absorption, and secretion in the GI tract. Intestinal contents pass through the small and large intestine too quickly to allow for the usual absorption of fluid and nutrients. Irritation within the colon results in increased mucus secretion. As a result, feces become watery, and the patient is unable to control the urge to defecate. Normally an anal bag is safe and effective in long-term treatment of patients with fecal incontinence at home, in hospice, or in the hospital. Fecal incontinence is expensive and a potentially dangerous condition in terms of contamination and risk of skin ulceration
HEMORRHOIDS
Hemorrhoids are dilated, engorged veins in the lining of the rectum. They are either external or internal.
FLATULENCE
As gas accumulates in the lumen of the intestines, the bowel wall stretches and distends (flatulence). It is a common cause of abdominal fullness, pain, and cramping. Normally intestinal gas escapes through the mouth (belching) or the anus (passing of flatus)
FECAL INCONTINENCE
Fecal incontinence is the inability to control passage of feces and gas from the anus. Incontinence harms a patient’s body image
PREPARATION AND GIVING OF LAXATIVESACCORDING TO POTTER AND PERRY,
An enema is the instillation of a solution into the rectum and sig
CRISPR-Cas9, a revolutionary gene-editing tool, holds immense potential to reshape medicine, agriculture, and our understanding of life. But like any powerful tool, it comes with ethical considerations.
Unveiling CRISPR: This naturally occurring bacterial defense system (crRNA & Cas9 protein) fights viruses. Scientists repurposed it for precise gene editing (correction, deletion, insertion) by targeting specific DNA sequences.
The Promise: CRISPR offers exciting possibilities:
Gene Therapy: Correcting genetic diseases like cystic fibrosis.
Agriculture: Engineering crops resistant to pests and harsh environments.
Research: Studying gene function to unlock new knowledge.
The Peril: Ethical concerns demand attention:
Off-target Effects: Unintended DNA edits can have unforeseen consequences.
Eugenics: Misusing CRISPR for designer babies raises social and ethical questions.
Equity: High costs could limit access to this potentially life-saving technology.
The Path Forward: Responsible development is crucial:
International Collaboration: Clear guidelines are needed for research and human trials.
Public Education: Open discussions ensure informed decisions about CRISPR.
Prioritize Safety and Ethics: Safety and ethical principles must be paramount.
CRISPR offers a powerful tool for a better future, but responsible development and addressing ethical concerns are essential. By prioritizing safety, fostering open dialogue, and ensuring equitable access, we can harness CRISPR's power for the benefit of all. (2998 characters)
Medical Technology Tackles New Health Care Demand - Research Report - March 2...pchutichetpong
M Capital Group (“MCG”) predicts that with, against, despite, and even without the global pandemic, the medical technology (MedTech) industry shows signs of continuous healthy growth, driven by smaller, faster, and cheaper devices, growing demand for home-based applications, technological innovation, strategic acquisitions, investments, and SPAC listings. MCG predicts that this should reflects itself in annual growth of over 6%, well beyond 2028.
According to Chris Mouchabhani, Managing Partner at M Capital Group, “Despite all economic scenarios that one may consider, beyond overall economic shocks, medical technology should remain one of the most promising and robust sectors over the short to medium term and well beyond 2028.”
There is a movement towards home-based care for the elderly, next generation scanning and MRI devices, wearable technology, artificial intelligence incorporation, and online connectivity. Experts also see a focus on predictive, preventive, personalized, participatory, and precision medicine, with rising levels of integration of home care and technological innovation.
The average cost of treatment has been rising across the board, creating additional financial burdens to governments, healthcare providers and insurance companies. According to MCG, cost-per-inpatient-stay in the United States alone rose on average annually by over 13% between 2014 to 2021, leading MedTech to focus research efforts on optimized medical equipment at lower price points, whilst emphasizing portability and ease of use. Namely, 46% of the 1,008 medical technology companies in the 2021 MedTech Innovator (“MTI”) database are focusing on prevention, wellness, detection, or diagnosis, signaling a clear push for preventive care to also tackle costs.
In addition, there has also been a lasting impact on consumer and medical demand for home care, supported by the pandemic. Lockdowns, closure of care facilities, and healthcare systems subjected to capacity pressure, accelerated demand away from traditional inpatient care. Now, outpatient care solutions are driving industry production, with nearly 70% of recent diagnostics start-up companies producing products in areas such as ambulatory clinics, at-home care, and self-administered diagnostics.
R3 Stem Cells and Kidney Repair A New Horizon in Nephrology.pptxR3 Stem Cell
R3 Stem Cells and Kidney Repair: A New Horizon in Nephrology" explores groundbreaking advancements in the use of R3 stem cells for kidney disease treatment. This insightful piece delves into the potential of these cells to regenerate damaged kidney tissue, offering new hope for patients and reshaping the future of nephrology.
CHAPTER 1 SEMESTER V PREVENTIVE-PEDIATRICS.pdfSachin Sharma
This content provides an overview of preventive pediatrics. It defines preventive pediatrics as preventing disease and promoting children's physical, mental, and social well-being to achieve positive health. It discusses antenatal, postnatal, and social preventive pediatrics. It also covers various child health programs like immunization, breastfeeding, ICDS, and the roles of organizations like WHO, UNICEF, and nurses in preventive pediatrics.
3. • INTRODUCTION AND ANATOMY OF THE EYE
• PARTS OF THE EYE AND THEIR FUNCTIONS
• BLOOD SUPPLY TO THE EYE
• INNERVATION OF THE EYE
• EYE PATHOLOGIES AND VISION PROBLEMS
• RADIOGRAPHIC APPEARANCE OF THE EYE
• IMAGING PROCEDURES OF THE EYE
4. • 70% of all sensory receptors are in the eye.
• The human eye can differentiate between 10
million colours and is possibly capable of
detecting a single photon.
• The human eye is a sense organ that allows
vision.
• Human eyes help to provide three
dimensional, moving image, normally
coloured in daylight
5. Includes
• bony orbit
• eyelids
• eyelashes
• fat glands
• extra ocular muscles
• conjunctiva
6.
7. • Sclera: outer white layer; maintains the shape of
the eye; muscles attached control eye movement
• Choroid : contains blood vessels
• Retina : innermost light-sensitive membrane
covering the back wall of the eyeball.
8.
9.
10. • The eye is not shaped like a perfect sphere. It is a fused two-piece unit,
composed of the anterior segment and the posterior segment.
• The anterior segment is made up of the cornea, iris and lens. The cornea is
transparent and more curved, and is linked to the larger posterior
segment, composed of the vitreous, retina, choroid and the outer white
shell called the sclera.
• The cornea is typically about 11.5 mm (0.3 in) in diameter.
• The cornea and sclera are connected by an area termed the limbus. The
iris is the pigmented circular structure concentrically surrounding the
center of the eye, the pupil, which appears to be black.
• The size of the pupil, which controls the amount of light entering the eye,
is adjusted by the iris' dilator and sphincter muscles.
11.
12. • The eye is divided into anterior and posterior chambers by the iris.
• Anterior portion is filled with aqueous humor where as the posterior is fi
lled with vitreous humor.
• Aqueous humor:
-clear liquid
-inflates eye (intraocular pressure).
-Nourishes cornea and lens
-Provides clear medium for passage of light
• Vitreous humor:
-Clear, gel-like mass of water and proteins.
-Gives shape to the eye.
-Holds retina in place against choroid.
-Allows easy passage of light.
13. There are four
rectus and two
oblique muscles
• Lateral rectus
• Medial rectus
• superior
rectus
• Inferior rectus
• Inferior
oblique
• Superior
oblique
14. Rods and Cones
• rod cells: light sensors
– 120 million
– Functions in less intense light
– Used in peripheral vision
– Responsible for night vision
– Detects black, white and shades of
grey
• cone cells: detects colour
– 7 million
– Highest concentration at fovea
centralis
– Functions best in bright light
– Perceives fine details
– 3 types of cone cells, each sensitive
to one of the
three primary additive colours: red,
green, and blue
15. • transparent covering of the
front of the eye
• Allows for the passage of light
into the eye and it also focuses
the light
18. • SCLERA – a tough white
skin (made of tissue)
that covers all of the
eyeball except the
cornea
19.
20.
21.
22. • On retina where optic nerve
leads back into the brain
• No rod or cone cells
• Other eye compensates for
this area
23. • The arterial input to the eye is
provided by several branches
from the ophthalmic artery,
which is derived from the
internal carotid artery in most
mammals.
• Venous outflow from the eye
is primarily via the vortex veins
and the central retinal vein,
which merge with the superior
and inferior ophthalmic veins
that drain into the cavernous
sinus, the pterygoid venous
plexus and the facial vein.
24. • It is a system of
protective features
that keeps blood
borne particles
from upsetting the
control and stable
environment for
the proper
functions of the
optic nerves.
• The two
components are
• Retina vessels and
the choroid.
25. • Sensory innervation is from the trigeminal
(fifth) cranial nerve, via the ophthalmic
division (upper lid) and maxillary division
(lower lid).
• The orbicularis oculi is innervated by the
facial (seventh) nerve.
• The levator muscle in the upper lid is
supplied by the oculomotor (third) nerve
26. • The optic nerve II: enters the orbit through the optic
foramen and passes to the light receptor cells in the retina.
• It allows the movements of the eye and is covered by
meninges that it acquired during its development.
• The Oculomotor nerve III: control the movement of the eyeball. it
enters the orbit through the orbital fissure.
– Supply: inferior, medial, Superior Rectus muscle
– inferior oblique muscle
• The abducens nerve VI: enters through the orbital foramen and
innervates most of retractor bulbi and lateral rectus muscles.
27. • Parasympathetic fibres to the lacrimal gland
pursue a complex course, passing with the
facial nerve and then following the maxillary
division of the trigeminal.
• The sensory and parasympathetic nerve
fibres reach the eyeball via the short and
long ciliary nerves which pierce the sclera
posteriorly.
30. • inability of the eye to
focus light from distant
objects
• see close objects clearly
• image focuses in front of
the retina
• Develops in childhood
and progressively
worsens
• Tends to stabilize in
adulthood
• Has a genetic component
• Affects a major part of the
population
31. Cause:
• Distance between lens
and retina is too long
(long eyeball)
• Cornea & lens converge
light too strongly
• (strong refractive
power)
• Corrected with a
diverging lens
32. • inability of the eye to focus light from
near objects no difficulty seeing distant
objects
• Babies are born slightly hyperopic. As
eye grows, condition fixes itself.
• image focused behind retina
Cause:
• Distance between lens and retina is too
small (short eyeball)
• Cornea & lens is too weak (doesn’t
Diverge rays enough)
• Corrected with converging lens
36. • Not commonly used nowadays
• A three-dimensional structure is
seen in two dimensional plane, giving
rise to disturbing superimposition.
• Moreover, its sensitivity to small
differences in the attenuation is low,
i.e., its contrast resolution is poor
Positions in imaging
• WATERS VIEW
• CALDWELL’S VIEW
• LATERAL VIEW
• SUBMENTOVERTEX VIEW
• RHESE VIEW
37. ADVANTAGES:
• BONY DETAILS /CALCIFICATION
• STRUCTURES LIKE EOM, OPTIC
NERVECAN BE VISUALISED
• IN ORBITAL TRAUMA FOR
DETECTING
DISADVANTAGES
• INABILITY TO DISTINGUISH
BETWEEN
PATHOLOGICAL SOFT TISSUE
MASS
WHICH ARE RADIOLOGICALLY
ISODENSE
• RADIATION INDUCED CATARACT
38. Advantages of MRI
Excellent soft tissue details
• Entire course of optic nerve
well studied
• No exposure to radiation
• Disadvantages:
• Less sensitive for detecting
bony abn. And calcification.
• Fat saturation artifacts can
mimic pathology.
MRI in retinoblastoma
&cavernous hemangioma
39. • Non invasive
• Well tolerated
• Safe
technique
Perineural inflammation of optic nerve