OCT-Angiography (OCT-A) uses motion contrast to non-invasively image the retinal and choroidal vasculature without the need for dye injection. It provides layer-by-layer 3D analysis and quantification. While it has advantages over fluorescein angiography like shorter acquisition time, OCT-A cannot image leakage or pooling and has limitations like motion artifacts and limited field of view. OCT-A is being used to evaluate diseases like diabetic retinopathy, macular degeneration, and vascular occlusions but currently serves as a complementary test rather than replacement for fluorescein angiography.
Optical coherence tomography angiography optovue a very basic lecture detailing the new advancement of dyeless angiography by spectral domain OCT system and SSADA and Motion correction algorithm
Optical coherence tomography angiography optovue a very basic lecture detailing the new advancement of dyeless angiography by spectral domain OCT system and SSADA and Motion correction algorithm
Branched Retinal Vein Occlusion (BRVO) for undergraduate MBBS Students.
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Role of imaging in glaucoma management gunjan chadha
Glaucoma is chronic progressive optic neuropathy in which structural damage( Optic Nerve Head and Retinal Nerve Fiber Layer) proceeds the functional deterioration( Visual Field loss).
Hence structural imaging plays an important role in early diagnosis and follow up of a patient of glaucoma
Branched Retinal Vein Occlusion (BRVO) for undergraduate MBBS Students.
Covers the basics of Aetiology, pathophysiology, clinical features, types, associated conditions and management of BRVO.
Also encompasses salient points for PGMEE
Role of imaging in glaucoma management gunjan chadha
Glaucoma is chronic progressive optic neuropathy in which structural damage( Optic Nerve Head and Retinal Nerve Fiber Layer) proceeds the functional deterioration( Visual Field loss).
Hence structural imaging plays an important role in early diagnosis and follow up of a patient of glaucoma
OCT is a great technology,Many ophthalmologist find very difficult to understand it ,SO I have tired to simplify it as much as possible .Hope everyone can understand now onwards the basic about OCT .
Every feedback s most welcomed sothat i can improve further in coming days
Please email your feedback to me in the following address
yourgyanu@gmail.com
optical coherence tomography is a new tool that makes retinal diagnosis easier. the above ppt includes a detailed and precise notes on OCT and its interpretation.
SOLIX Essential is a technology built upon a proven foundation of high-speed Spectral Domain OCT. The SOLIX Essential offers state-of-the-art imaging from the cornea to the choroid with exclusive technology that will change your approach to disease diagnosis and management.
The Talk on "Strabismus" is aimed at making the understanding of strabismus easy for medical students. Professor Mazhry Explained Strabismus to a 4rth year Medical Student Undergraduate Ophthalmology informal discussion on the topic of Squint evaluation and clinical evaluation. Dr Abdullah Mazhry who is a 4th Year Medical student of Allama Iqbal medical college participated in the talk.
The talk "Chronic Issues of Dry Eyes" was delivered as a webinar series on 30 Jan 2021. Prof Dr Zia ul Mazhry was the guest speaker. The talk was followed by a lively Q&A session. This webinar was sponsored by Schaigan Pakistan with their leading dry eye treatment brand Eyelub Eye drops. Eyelube composition is as under:<br>Polyethylene Glycol 400 0.4% (lubricant), Propylene Glycol 0.3% (lubricant), Hydroxypropyl Guar (GEL FORMING MATRIX) Sodium Perborate as a disappearing preservative.
A patient education lecture explaining modern catract surgery solutions. Cataract surgery these days not only removes your glasses but can correct other preexisting errors as well. Toric and multifocal IOLs have opened new windows for visual rehabilitation after cataract surgery.
Comprehensive review of Ophthalmic Manifestations of Systemic Disorders for undergraduate medical students and general practionaers. Lecture was taken by Associate Professor Dr. Zia ul Mazhry at Central Park Medical College Lahore Pakistan.
The basic concepts about refractive errors and their corrective options are explained in this lecture. It was taken at Central Park Medical College Lahore Pakistan for fourth year medical students
Introduction to general ophthalmic evaluation and management principles. Lecture taken at Central Park Medical College Lahore Pakistan. The guidelines will be useful for General Practitioners as well.
Basics of clinical optics and their application in clinical ophthalmology. Introduction to principles of interaction of light and its travel through different media. The basic principles, objectives and methods of ophthalmic instruments are also explained.
Introduction to internal assessment criteria for ophthalmology undergraduate students. Lecture was taken at Central Park Medical College Lahore Pakistan for 4th year medical students.
Dr. Mazhry’ Surgical Video, “Inject First and Then Fixate Hydrophobic Single Piece AcrySof IOL” gets selected amongst top 11 ophthalmology videos in the world.
wins a place on American academy of Ophthalmology’s ONE net work during Global ONE Video Contest 2014.
First ever video from Pakistan to get featured on the ONE Network by American Academy of Ophthalmology.
Title:
Choosing amongst current modalities to manage Diabetic Retinopathy
At Medical Retina Clinic, Eye Department WAPDA Teaching Hospital Complex Lahore
Objective:
1. To review the current management options for DR
2. To share author’s four years follow up from Jan 2008 to Nov 2011 at Medical Retina Clinic, Eye Department WAPDA Teaching Hospital Complex Lahore.
3. Discussion on future Trends in management of DR.
Synopsis:
Diabetic retinopathy is the leading cause of new blindness in the world,
Argon LASER treatment has established itself as a gold standard in the management of DR. Intravitreal therapies in the form anti VEGF agents and steroids are also being widely used nationally and internationally. These therapies do not replace but complement each other.
Author will share his four years experience at Medical Retina clinic WAPDA hospital complex Lahore. 125 patients with DR were enrolled during this period. Treatment modalities used, included Argon Green Laser, Intravitreal Anti VEGF (Bevacizumab), Intravitreal Triamcinolone and subtenon Triamcinolone. Staging and severity of the disease as well as response to the offered therapy were the parameters used to tailor the treatment options.
Dr. Zia ul Mazhry
FRCS (Edin), FRCS (Glasgow), FCPS, CICOphth (UK)
Asstt Professor Central Park Medical College Lahore.
Consultant Eye Surgeon and Head of Eye Department
Wapda Teaching Hospital Complex
210 Feroz Pur Road Lahore.
Website: www.EyeAcuity.com
mazhry@yahoo.com
03004401151
Title:
Choosing amongst current modalities to manage Diabetic Retinopathy
At Medical Retina Clinic, Eye Department WAPDA Teaching Hospital Complex Lahore
Objective:
1. To review the current management options for DR
2. To share author’s four years follow up from Jan 2008 to Nov 2011 at Medical Retina Clinic, Eye Department WAPDA Teaching Hospital Complex Lahore.
3. Discussion on future Trends in management of DR.
Synopsis:
Diabetic retinopathy is the leading cause of new blindness in the world,
Argon LASER treatment has established itself as a gold standard in the management of DR. Intravitreal therapies in the form anti VEGF agents and steroids are also being widely used nationally and internationally. These therapies do not replace but complement each other.
Author will share his four years experience at Medical Retina clinic WAPDA hospital complex Lahore. 125 patients with DR were enrolled during this period. Treatment modalities used, included Argon Green Laser, Intravitreal Anti VEGF (Bevacizumab), Intravitreal Triamcinolone and subtenon Triamcinolone. Staging and severity of the disease as well as response to the offered therapy were the parameters used to tailor the treatment options.
Dr. Zia ul Mazhry
FRCS (Edin), FRCS (Glasgow), FCPS, CICOphth (UK)
Asstt Professor Central Park Medical College Lahore.
Consultant Eye Surgeon and Head of Eye Department
Wapda Teaching Hospital Complex
210 Feroz Pur Road Lahore.
Website: www.EyeAcuity.com
mazhry@yahoo.com
03004401151
Dark Room Procedures for undergraduates(MB,BS) in the field of Ophthalmology are explained in simple terms in this presentation. Series of lectures taken at Central Park Medical College Lahore Pakistan.
Title: Making dry eyes wet
Author: Dr. Zia ul Mazhry
FRCS (Edin), FRCS (Glasgow), FCPS, CICOphth (UK)
PURPOSE: to review current management options to treat dry eyes especially evaluation of Genteal gel and Systane eye drops as novel new combinations.
clinical outcome. RESULTS: both the agents showed higher satisfaction and better clinical outcomes as compared to other available wetting agents. CONCLUSION: Genteal eye gel and Syatane eye drops are excellent recent additions to available options to treat dry eyes symptomatically. Genteal family appears to be better tolerated as compared to Systane E/D in our experience.
Dr. Zia ul Mazhry
FRCS (Edin), FRCS (Glasgow), FCPS, CICOphth (UK)
Consultant Eye Surgeon and Head of Eye Department
Wapda hospital complex
210 Feroz Pur Road Lahore
0300 440 1151
Title Secondary posterior chamber IOL (PC IOL) Implantation-made simple
Author(s) Dr zia u Mazhry FRCS, FCPS
Abstract Objective:
1. To classify Indications and to discuss surgical planning for secondary PC IOL implantation
2. To elaborate variations of surgical procedure required to manage different situations encountered in secondary PC IOL implantation.
Synopsis:
Secondary PC IOL implantation in aphakics is an established procedure. Variation of surgical procedure are required to manage different situations. The status of posterior capsule may vary from intact to partially deficient or totally absent. Similarly the technique has to be varied from simple implantation to synechiolysis to anterior vitrectomy combined with single or double haptic trans-scleral fixation of PC IOL.This course will present simplified approach to manage secondary IOL implantation.
Presentation Instruction Course
Subspecialty ophthalmology,Cataract
Education Level advance
Course Format lecture
Target Audience general
Course Length 60 minutes
Program english
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3. INTRODUCTION-OCTA Principle
OCT-Angiography (OCT-A) is a
non-invasive imaging
technique of the retinal and
choroidal vasculature and
microvasculature. OCT-A uses
the principle of “motion
contrast” for the detection of
blood flow.
4. Features of OCT-Angio
• OCT-A does not require an injection
of contrast dye,
• ability to perform a layer-by-layer
analysis of the vasculature
– with a 3-dimensional (3D) approach;
– the entire retina,
• RPCP+SCP+ICP,
• DCP,
• Outer Retina and
• Choroid
• Leakage, pooling or staining regions
– are normally not detected by OCT-A
– do not present enough “motion” to be
imaged
5. Advantages over conventional
angiography methods
• shorter acquisition time and being a non-
invasive process
• One asset of this OCT-based approach is that it
provides a quantitative analysis
• OCT-A technology provides "3-D" imaging
information of the macula
6. Strengths-
Ischemia
Evaluation
OCTA of a patient
with sickle cell
maculopathy. Note
that while the SCP
is relatively
preserved (A), the
DCP shows areas
of ischemia
temporal to the
fovea (B).
7. Strengths-
Better
Visualization
of CNVs
• A) FA image of a large,
mature fibrovascular scar
from type 1 CNV. Because of
the extensive scarring of the
macula, there is
hypofluorescence centrally.
• B) OCTA image overlaid on
FA. In this case, OCTA is able
to image the CNV lesion in
greater detail than FA, with
the mature trunks of the CNV
lesion clearly visible.
• C) The sub-RPE space was
segmented to isolate the CNV
lesion.
8. FFA and OCTA
comparison in
BRVO
• A) Early-phase FA of a
BRVO.
• B) Mid-phase FA.
• C) OCTA en face image
of the retina, with
corresponding B-scan.
• D) OCTA en face image
segmenting the
preretinal space, with
corresponding B-scan.
9. Fovea Plana
Beauty of
Segmentation
OCTA images of a patient
with fovea plana.
• A) SCP demonstrates the
absence of a normal FAZ.
The corresponding B-scan
shows no foveal
depression.
• B) OCTA en face image of
the DCP shows that
although the FAZ is
absent in the SCP, it is
still present in the DCP.
10. Limitations & Artefacts
• Media opacities can lead to signal attenuation and
shadowing artifact.
• Projection artifact is inevitable
• OCT-A examination is extremely motion-sensitive and
requires patient collaboration
• Automated segmentation of structural abnormal retinas
is also an unavoidable limitation of OCT-A imaging.
• the limited area of visualization (3mm2 to 12mm2) is a
current limitation.[
• OCT-A detects "motion", and thus very low amounts of
blood
11. OCTA-
LIMITATIONS
/ ARTIFACTS
• A) OCTA en face image with
a dark area caused by a
floater (yellow dashed
circle).
• B) The structural en face
image shows the same
artifact in the same location.
• C) B-scan through the area
shows are dark shadow
through all layers of the
retina, suggesting that this
is a vitreal floater.
13. LIMITATIONS
/ ARTIFACTS-
Leakage not
visible
• A) OCTA en face image
of the retina of a
patient with diabetic
macular edema.
Retinal ischemia
around the FAZ can be
seen, but intraretinal
fluid and leakage are
not visible.
• B) B-scan shows
intraretinal fluid at the
macula.
16. Nidek OCT-Angiography
• high resolution OCT
• an integrated SLO system
• Wide Field OCT-
Angiography
• Eye Tracer
• CNV Analysis
• Selectable OCT Sensitivity
• Choroidal Visualization
22. Summary
• the word “angiography” as part of their names, it is natural for clinicians to
draw comparisons between the two imaging modalities, and even explore the
possibility of replacing FA with OCTA.
• It is important to note that while both OCTA and FA aim to image blood flow,
they are different technologies, and will therefore image vascular features
differently. Although OCTA generally shows good agreement with FA, it does
not, at least presently, serve as a replacement for FA.
• As mentioned above, OCTA is not able to image leakage. In addition, staining,
pooling, and vessel filling time are also not features of OCTA. However, this
also means that vasculature below an area of fluid, which would otherwise be
obscured by dye leakage with FA, can be seen on OCTA4. Since they each
have their strengths and weaknesses, determining which test is indicated for
the patient should be based on clinical need.
• Most likely, OCTA will serve as a complementary test to FA, giving clinicians
additional information for assessing retinal vasculature.