Vision Fatigue Condition Caused by Overuse
Puzzle 7 of Safety First Hard Pack
Question is: Vision Fatigue Condition Caused by Overuse
and the answer is: EYESTRAIN
Word Meaning:
EYESTRAIN — (medicine, ophthalmology) Tiredness or pain in the eyes, sometimes accompanied by headache, caused by excessive or improper use of the eyes, or by uncorrected defects of vision.
Definitions from Wiktionary.