lenses for digital eye strain caused by blue light from electronic screens. Amber-tinted lenses have been shown to affect the circadian rhythm and treat delayed sleep phase disorder. Prevalence According to the US National Institute for Occupational Safety and Health, computer vision syndrome affects about 90% of the people who spend three hours or more a day at a computer. Another study in Malaysia was conducted on 795 university 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. See also Asthenopia (Eye Strain) Effects of blue light technology Electronic media and sleep List of repetitive strain injury software (break reminders) Ocular neurosis Photophobia Repetitive strain injury Presbyopia Visual looming syndrome Visual snow References External links Eye diseases Overuse injuries Syndromes Occupational diseases