noun.
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.
noun.tiredness or pain in the eyes, sometimes accompanied by headache, caused by excessive or improper use of the eyes, or by uncorrected defects of vision
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem