This is when you see halos or blur when exposed to bright lights. Many people with dense cataracts complain of glare while driving at night … the headlights from oncoming traffic make it hard to see. Glare is usually associated with cataracts and one of the indicators that it may be time for cataract surgery.  Another cause of glare is corneal swelling from diseases like Fuchs’ dystrophy. Some people have sensitive eyes and seem to suffer from glare without any obvious anatomic abnormalities. Sunglasses during the day may help. At night, a glare-resistant coating on glasses may help.

Dr. Timothy Root is a practicing ophthalmologist and cataract surgeon in Daytona Beach, Florida. His books, video lectures, and training resources can be found at:


  1. Celine, the standard way we check glare sensitivity is with the BAT (brightness acuity test). This involves a light held next to the eye while reading the eye chart. The amount of glare disability can be “quantified” by measuring the decrease in vision on the Snellen acuity chart.


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