n. An ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, red eyes, eye strain, pain in or around the eyes, blurred vision, headache and occasional double vision.
the GNU version of the Collaborative International Dictionary of English
n. Weakness of sight.
The Century Dictionary and Cyclopedia
n. Weakness of the eyes.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem