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Related Concept Videos

Glaucoma: Overview01:25

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Open Angle Glaucoma: Treatment01:27

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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Angle Closure Glaucoma: Treatment01:28

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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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OCT Angiography Artifacts in Glaucoma.

Alireza Kamalipour1, Sasan Moghimi1, Huiyuan Hou1

  • 1Hamilton Glaucoma Center, Shiley Eye Institute, Viterbi Family Department of Ophthalmology, University of California San Diego, La Jolla, California.

Ophthalmology
|April 5, 2021
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Summary
This summary is machine-generated.

Artifacts frequently degrade optical coherence tomography angiography (OCTA) image quality, impacting glaucoma diagnosis. Patient age, gender, and ocular factors influence artifact prevalence, necessitating careful review beyond automated quality scores.

Keywords:
ArtifactGlaucomaOCT angiography

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Optical coherence tomography angiography (OCTA) is crucial for visualizing ocular vasculature.
  • Image artifacts can compromise the diagnostic accuracy of OCTA scans, particularly in glaucoma assessment.
  • Understanding artifact prevalence and contributing factors is essential for reliable OCTA interpretation.

Purpose of the Study:

  • To determine the prevalence of various artifacts in OCTA images of healthy and glaucoma eyes.
  • To evaluate characteristics associated with poor-quality OCTA images.
  • To assess the reliability of automated quality measures in detecting good-quality OCTA scans.

Main Methods:

  • Retrospective analysis of 5263 OCTA scans from 649 eyes (healthy, glaucoma suspect, glaucoma patients).
  • Expert reviewers identified artifacts (eye movement, defocus, shadow, etc.) in superficial vascular layers.
  • Demographic and ocular factors were analyzed for association with poor image quality.

Main Results:

  • 33.9% of OCTA images exhibited poor quality due to artifacts.
  • Older age, male gender, worse visual field mean deviation, absence of eye tracking, and macular scan area were linked to higher artifact rates.
  • Automated quality measures (QS, signal strength index) showed limited accuracy in detecting good-quality images (AUCs 0.65-0.70).

Conclusions:

  • OCTA artifacts are common and influenced by patient and ocular characteristics.
  • Relying solely on automated quality assessments is insufficient for accurate OCTA interpretation.
  • Systematic review and potential image reacquisition are recommended for ensuring OCTA image reliability in clinical practice.