Four Types of Glare: 3. Discomforting Glare

Glare is defined as a visual condition in which the observer feels either discomfort and/or exhibits a lower performance in visual tests (e.g. visual acuity or contrast sensitivity). This is produced by a relatively bright source of light--called the glare source--within the visual field. A given bright light may or may not produce glare depending upon the location and intensity of the light source, the background luminance, the state of adaptation of the eye or the clarity of the media of the eye. Although the term "glare" is used many times in a general sense, there are actually four different types of glare. The third type of glare is Discomforting Glare. Discomforting Glare occurs due to changing light conditions and can cause squinting, eye fatigue or may even make your eyes water. Photochromic lenses can eliminate this type of glare.

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