eyestrain

[ahy-streyn]
noun
a sensation of discomfort produced in the eyes by their excessive or improper use: to have eyestrain from reading fine print in poor light.

Origin:
1870–75; eye + strain

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World English Dictionary
eyestrain (ˈaɪˌstreɪn)
 
n
fatigue or irritation of the eyes, resulting from excessive use, as from prolonged reading of small print, or uncorrected defects of vision

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

eyestrain eye·strain (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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Too much light contributes to eyestrain, as does too little.
The way the screens work cause severe eyestrain, and can even contribute to
  migraines.
But the price paid is a slightly jerkier image and a flickering that can cause
  headaches and eyestrain.
Writers and editors who use computers for extended periods may experience back
  pain, eyestrain or fatigue.
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