eyestrain

n.
Pain and fatigue of the eyes, often accompanied by headache, resulting from prolonged use of the eyes, uncorrected defects of vision, or an imbalance of the eye muscles.

(ī'strān')
n.

Pain and fatigue of the eyes, often accompanied by headache, due to prolonged use of the eyes, uncorrected defects of vision, or an imbalance of the eye muscles. Also called asthenopia.

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The noun has one meaning:

Meaning #1: a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem
  Synonym: asthenopia

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