Assessing Visual Function in Geographic Atrophy Using Microperimetry
Author Information
Author(s): Alibhai A. Yasin, Moult Eric, Jamil Muhammad Usman, Raza Khadija, Morales Marco U., Ribiero Ramiro, Baumal Caroline R., Fujimoto James G., Waheed Nadia K.
Hypothesis
To assess the repeatability of a microperimetry methodology for quantifying visual function changes in the junctional zone of eyes with geographic atrophy.
Conclusion
The methodology is repeatable and compatible with standard microperimetry, making it suitable for analyzing retinal sensitivity in high-risk areas.
Supporting Evidence
- The intraclass correlation for mean junctional zone sensitivity was 0.994, indicating high repeatability.
- The coefficient of repeatability for the total number of scotomatous points was 0.218, showing consistent results across graders.
- Bland-Altman analysis showed that 90% of the eyes were within ± 1.96 SD for mean sensitivity.
- The study used a standard 10–2 fovea centered grid for microperimetry, enhancing its applicability in clinical trials.
- Microperimetry allows for functional mapping of the retina, which is crucial for assessing visual function changes.
Takeaway
This study looks at a new way to measure how well people see in areas of the eye affected by a disease called geographic atrophy, and it shows that this method works well.
Methodology
A post hoc analysis of the OAKS phase III trial was conducted, using microperimetry to assess visual function in patients with geographic atrophy.
Potential Biases
Inter-grader discrepancies may arise from the image transformation process used in the analysis.
Limitations
The microperimetry stimuli are relatively sparse and randomly distributed, which may miss smaller regions of functional impairment.
Participant Demographics
Patients with geographic atrophy secondary to age-related macular degeneration.
Digital Object Identifier (DOI)
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