(noun)Pain and fatigue of the eyes,oftenaccompanied by headache,resulting from prolongeduse of the eyes,uncorrecteddefects of vision, or animbalance of the eyemuscles.
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."