Visual Field Progression in the Ocular Hypertension Treatment Study

Area of Science:

• Ophthalmology
• Glaucoma Research
• Visual Field Analysis

Background:

• Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
• The Ocular Hypertension Treatment Study (OHTS) has provided critical data on POAG progression.
• Understanding visual field (VF) loss rates is crucial for managing POAG.

Purpose of the Study:

• To quantify the rate of VF loss before and after POAG diagnosis in OHTS participants.
• To compare VF loss rates in different POAG subtypes (optic disc vs. VF defect).

Main Methods:

• Prospective analysis of data from the OHTS clinical trial.
• Calculation of mean deviation (MD) slopes using linear regression for pre- and post-POAG diagnosis periods.
• Inclusion of participants with a minimum of 5 VFs for each period.

Main Results:

• The mean age at POAG diagnosis was 66.4 years; 56% were male.
• Post-POAG VF loss rates varied: -0.40 dB/year for all POAG eyes, -0.19 dB/year for optic disc POAG only, and -0.54 dB/year for VF POAG.
• A significant proportion of VF POAG eyes showed rapid progression (≥ -0.5 dB/year in 41%, ≥ -1.0 dB/year in 21%).

Conclusions:

• Some POAG patients experience rapid VF loss despite clinical monitoring.
• Ocular hypertensive individuals, particularly those at high risk for POAG, require diligent follow-up.
• Early diagnosis and timely treatment are essential to mitigate vision loss in POAG.