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)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "eyestrain" in a sentence
"I've been submerged with Guide proofreading, a semi-annual communal exercise in eyestrain and Twizzlers and chocolate-fueled mania; yesterday I couldn't stop calling everyone "enthusiasts" after reading the word one too many times."
"Can’t stand the eyestrain from a fluourescent bulb."
"I am unsure what kind of eyestrain the iPad would cause however."