noun Ophthalmology.
a fatigue or tiring of the eyes, usually characterized by discomfort, dimness of vision, and headache, caused by overuse of the visual organs, dysfunction of the ocular muscles, and incorrect refraction.

< Greek asthen(ḗs) frail (see asthenia) + -opia

asthenopic [as-thuh-nop-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
asthenopia (ˌæsθɪˈnəʊpɪə)
a technical name for eyestrain
[C19: from New Latin, from Greek asthenēs weak (from a-1 + sthenos strength) + ōps eye]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

asthenopia as·the·no·pi·a (ās'thə-nō'pē-ə)
See eyestrain.

as'the·nop'ic (-nŏp'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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