Repeatability of visual function measures in age-related macular degeneration

Area of Science:

• Ophthalmology
• Clinical Research
• Vision Science

Background:

• Age-related macular degeneration (AMD) is a leading cause of vision loss.
• Understanding the repeatability of visual function tests is crucial for monitoring disease progression and treatment efficacy in AMD patients.

Purpose of the Study:

• To evaluate the repeatability of key visual function measures in individuals with varying stages of age-related macular degeneration (AMD).
• Specifically, to assess the consistency of visual acuity, contrast sensitivity, and reading performance tests over a one-month interval.

Main Methods:

• One hundred subjects with early, intermediate, or late AMD (with active neovascular AMD in the fellow eye) were enrolled.
• Standardized protocols were used by trained optometrists to assess LogMAR visual acuity, contrast sensitivity, and reading performance.
• These assessments were repeated after one month to determine repeatability.

Main Results:

• Data from 83 subjects were analyzed, revealing coefficients of repeatability for LogMAR visual acuity (14.9 letters) and Pelli Robson contrast sensitivity (7.2 letters).
• Intraclass correlation coefficients (ICCs) were high for visual acuity (0.96) and contrast sensitivity (0.93), indicating good reliability.
• ICCs for reading performance measures (reading acuity, reading speed, critical print size) were lower, ranging from 0.74 to 0.75.

Conclusions:

• The study confirms the variability of visual functions in AMD patients, consistent with prior research.
• Visual acuity and contrast sensitivity demonstrated superior repeatability compared to reading performance metrics in this AMD cohort.