Abstract
Visual fatigue is caused by display operations on a PC for a long time in a day, which might be serious if it exceeds the circadian limit. To avoid this kind of events, any action to check them by oneself needs to be done if these continue for multiple hours. This paper employs a simple method to check for visual fatigue with declines in visual accommodation during the display operations on the PC as indexes. Testing the fatigue of human eyes was sensed by using Landolt rings displayed on a smartphone newly used as a tiny high precision display. The daily check will help the display operators on the PC to keep visual health, avoiding them from the fatigue exceeding the circadian change limit. The visual distance was successfully set at 0.5 m on a smartphone for checking declines in visual accommodation.
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