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Updated: Dec 12, 2025

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
Published on: March 26, 2020
Optical Coherence Tomography-Angiography in Geographic Atrophy
Philipp L Müller1,2, Maximilian Pfau3,4, Steffen Schmitz-Valckenberg3,5
1Department of Ophthalmology, University of Bonn, Bonn, Germany, philipp.mueller@ukbonn.de.
Optical coherence tomography angiography (OCT-A) reveals choriocapillaris flow alterations preceding geographic atrophy (GA) in age-related macular degeneration, aiding diagnosis and predicting progression.
Area of Science:
- Ophthalmology
- Medical Imaging
- Retinal Diseases
Background:
- Geographic atrophy (GA) is the late stage of age-related macular degeneration, causing legal blindness.
- GA involves photoreceptor, retinal pigment epithelium, and choriocapillaris loss, with unclear layer contribution to progression.
- Optical coherence tomography angiography (OCT-A) provides 3D retinal blood flow visualization.
Purpose of the Study:
- Review the application of OCT-A in diagnosing and understanding geographic atrophy.
- Summarize OCT-A's role in GA pathophysiology, differential diagnosis, and patient assessment.
- Highlight opportunities and limitations of OCT-A in GA research.
Main Methods:
- Literature review of studies utilizing OCT-A for geographic atrophy assessment.
- Analysis of OCT-A findings related to choriocapillaris flow alterations in GA.
- Evaluation of OCT-A's diagnostic and prognostic capabilities for GA.
Main Results:
- OCT-A shows choriocapillaris flow alterations are linked to GA development and progression.
- These alterations spatially exceed GA boundaries and predict future disease advancement.
- OCT-A aids in differentiating GA from similar retinal conditions.
Conclusions:
- OCT-A is a valuable tool for studying GA pathophysiology and progression.
- OCT-A enhances differential diagnosis and patient assessment in age-related macular degeneration.
- Further research using OCT-A can refine understanding and management of geographic atrophy.
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