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Rapid eye movements significantly delayed in people with glaucoma
Date:12/6/2012

TORONTO, DEC. 6, 2012Rapid eye movements are significantly delayed in patients with glaucoma, even those in the early stages of the disease, research has found.

The findings, led by Dr. Neeru Gupta, an ophthalmologist at St. Michael's Hospital, may shed new light on why glaucoma patients are at increased risk for falls and car accidents. Glaucoma is the leading cause of irreversible blindness.

Rapid (or saccadic) eye movements are the quick, simultaneous movements of both eyes in the same direction. They are involved in a myriad of everyday activities, from reading to scanning the surrounding environment, be it a busy subway station, grocery store shelves or oncoming traffic.

Dr. Gupta and co-workers studied groups of people with and without glaucoma who wore a head-mounted device that measured the length of time it took their eyes to move from one point to another, how long it took their eyes to begin the movement, did they focus on an object right away or did their eyes overshoot the target.

"Most of us take that processing of information for granted," she said.

However, she found that people with glaucoma showed delayed eye movement reaction times by about 15 per cent, even if they were in the early stages of the disease.

The findings were published online in the journal Eye and Brain.

Dr. Gupta said the findings are significant because they suggest that approaches to measuring vision loss beyond eye charts or visual field tests that related to real world settings may provide important clues to how the disease affects the lives of glaucoma patients. Glaucoma is becoming more common as the population ages and is expected to affect 80 million people worldwide by 2020. About half of all cases remain undiagnosed.

Currently, glaucoma can be diagnosed only by using a light to examine the optic nerve. Eye charts will not catch glaucoma, because it begins with peripheral vision loss long before reaching central vision.

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Contact: Leslie Shepherd
shepherdl@smh.ca
416-864-4094
St. Michael's Hospital
Source:Eurekalert

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