Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Weakness or fatigue of the eyes, usually accompanied by headache and dimming of vision.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • 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.

from the GNU version of the Collaborative International Dictionary of English

  • n. Weakness of sight.

from The Century Dictionary and Cyclopedia

  • n. Weakness of the eyes.

from 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

Etymologies

asthen(ia) + -opia.
(American Heritage® Dictionary of the English Language, Fourth Edition)
New Latin, "weak vision", ultimately from Greek roots as follows: a-, without + sthenos, strength + -opia, visual condition (from op, eye) (Wiktionary)

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