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computer vision syndrome
Computer vision syndrome (CVS) is a condition, often temporary, resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time. Some symptoms of CVS include headaches, blurred vision, neck pain, redness in the eyes, fatigue, eye strain, dry eyes, irritated eyes, double vision, vertigo/dizziness, polyopia, and difficulty refocusing the eyes. These symptoms can be further aggravated by improper lighting conditions (i.e. glare or bright overhead lighting) or air moving past the eyes (e.g. overhead vents, direct air from a fan).
==Prevalence==
According to the National Institute of Occupational Safety and Health, computer vision syndrome affects about 90% of the people who spend three hours or more a day at a computer.〔(Becoming a Squinter Nation ), Wall St. Journal, August 17, 2010〕
Another study in Malaysia was conducted on 795 college students aged between 18 and 25. The students experienced headaches along with eyestrain, with 89.9% of the students surveyed feeling any type of symptom of CVS.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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