This may lead to a vicious cycle of tensing those muscles further and causing more distress. Some people, while concentrating on a visually intense task such as reading fine print, using the computer for hours at a time, or trying to see in the dark, unconsciously clench the muscles of their eyelids, face, temples, and jaws and develop discomfort or pain from overuse of those muscles. The symptoms of ocular fatigue, tired eyes, blurring, headaches, and occasionally doubling of the vision are brought on by concentrated use of the eyes for visual tasks. The medical term for eye strain is asthenopia.
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