Temporal contrast adaptation in the analysis of visual function in primary open-angle glaucoma.

Area of Science:

• Ophthalmology
• Visual Neuroscience
• Medical Diagnostics

Background:

• Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
• Accurate visual function analysis is crucial for managing POAG, particularly in advanced stages.
• Current diagnostic tools may have limitations in assessing severe and end-stage glaucoma.

Purpose of the Study:

• To evaluate the utility of recovery time (RT) after temporal contrast adaptation using the Erlanger Flicker Test (EFT) for visual function analysis in POAG.
• To specifically assess the test's effectiveness in severe and end-stage glaucoma.
• To compare EFT results with established structural and functional glaucoma metrics.

Main Methods:

• The study involved 80 POAG eyes and 20 normal eyes, with POAG eyes categorized into five groups.
• The diagnostic efficacy and test-retest reproducibility of the EFT were assessed.
• Recovery time (RT) at various contrast levels was measured and compared between POAG and control groups, and correlated with structural and functional parameters.

Main Results:

• Normal eyes showed a decrease in RT with increased contrast; EFT demonstrated good test-retest reproducibility (ICC=0.6).
• Severe and end-stage POAG eyes exhibited significantly prolonged RT at 12%, 25%, and 35% contrast compared to controls (P<0.05).
• RT correlated significantly with visual acuity, mean defect, mean sensitivity, and optic nerve fiber layer thickness (P≤0.001). RT12% achieved an AUC of 0.863.

Conclusions:

• The Erlanger Flicker Test (EFT) is a valuable tool for diagnosing and analyzing visual function in POAG, especially in severe and end-stage cases.
• EFT, when combined with traditional parameters, can aid in disease staging for advanced glaucoma.
• The study developed a nomogram using RT and structural indicators for predicting disease progression.