Variability in patients with glaucomatous visual field damage is reduced using size V stimuli

Area of Science:

• Ophthalmology
• Visual Science
• Medical Technology

Background:

• Glaucoma is a leading cause of irreversible blindness.
• Automated perimetry is crucial for diagnosing and monitoring glaucoma.
• Variability in perimetry results can complicate diagnosis and management.

Purpose of the Study:

• To investigate if using size V stimuli can decrease variability in automated perimetry for glaucoma patients.
• To compare the variability of size I, III, and V stimuli in visual field testing.

Main Methods:

• Ten glaucoma patients and five controls underwent Humphrey Field Analyzer testing (24-2 or 30-2 programs).
• Frequency-of-seeing curves were measured using the method of constant stimuli with Goldmann sizes I, III, and V.
• Testing included areas of normal and damaged visual field sensitivity in glaucoma patients.

Main Results:

• Size V stimuli resulted in the lowest variability (standard deviation) at abnormal sensitivity test locations in glaucoma patients (2.9 dB).
• Variability was significantly lower with size V compared to sizes III (10.1 dB) and I (10.1 dB).
• A similar trend of reduced variability with size V was observed in normal sensitivity areas and peripheral testing in controls.

Conclusions:

• Employing size V stimuli in automated perimetry effectively reduces test variability for glaucoma patients.
• This reduction in variability applies to both moderately damaged and normal visual field areas.
• Size V stimuli offer a potential improvement for the reliability of glaucoma visual field assessment.