A Saccadic Choice Task for Target Face Detection at Large Visual Eccentricities in Patients with Glaucoma.

Area of Science:

• Ophthalmology
• Neuroscience
• Visual Perception

Background:

• Daily activities rely on wide field of view for scene recognition.
• Glaucoma patients often have visual field loss, affecting tasks like hazard detection.

Purpose of the Study:

• To investigate if glaucoma patients can detect faces at large visual eccentricities.
• To assess visual performance beyond standard perimetry limits in glaucoma.

Main Methods:

• Twelve glaucoma patients and 14 controls performed a face detection task.
• Stimuli were presented at eccentricities from 10° to 80° on a panoramic screen.
• Saccadic forced-choice task measured reaction time and accuracy.

Main Results:

• Glaucoma patients had slower saccade latencies and lower accuracy than controls.
• Performance significantly dropped beyond 40° eccentricity in glaucoma patients.
• Control subjects maintained above-chance performance up to 80° eccentricity.

Conclusions:

• Glaucoma patients' visual performance declines significantly beyond 40° eccentricity.
• This suggests reduced exploration spread in glaucoma patients.
• Clinical visual field testing should include larger eccentricities.