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Comparison of Visual Function Tests in Intermediate Age-Related Macular Degeneration
Robyn H Guymer1,2, Rose S Tan1,2, Chi D Luu1,2
1Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia.
Translational Vision Science & Technology
|October 12, 2021
Summary
Rod intercept time (RIT) is the most sensitive measure for detecting early age-related macular degeneration (AMD) compared to other visual function tests. This finding aids in monitoring disease progression and evaluating new treatments for intermediate AMD.
Area of Science:
- Ophthalmology
- Vision Science
- Retinal Diseases
Background:
- Intermediate age-related macular degeneration (iAMD) requires sensitive measures for monitoring progression.
- Early detection and intervention are crucial for managing AMD.
- Current visual function tests may vary in their sensitivity to early AMD changes.
Purpose of the Study:
- To identify the most sensitive visual function test for differentiating individuals with iAMD from healthy controls.
- To compare the discriminatory power of commonly used visual function tests in early AMD.
Main Methods:
- Prospective observational study comparing 25 iAMD patients and 23 healthy controls.
- Visual function testing included best-corrected visual acuity (BCVA), low luminance visual acuity (LLVA), mesopic microperimetry, dark adaptation, and scotopic perimetry.
- Data were standardized using z-scores for direct comparison of functional parameters.
Main Results:
- All tested parameters showed significant functional reduction in iAMD eyes (P ≤ 0.003).
- Rod intercept time (RIT) demonstrated the greatest reduction in function (mean z-score 4.5).
- Other parameters showed less pronounced differences: scotopic sensitivity (2.2), LLVA (1.2), mesopic sensitivity (1.0), and BCVA (1.0).
Conclusions:
- Rod intercept time (RIT) is the most discriminatory functional parameter for early-stage AMD.
- RIT can be utilized for assessing visual function in early AMD.
- RIT is a valuable tool for evaluating the efficacy of interventions targeting retinal function in early AMD.
