Which is the most engaging way of describing how to prevent eyestrain?
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a. to prevent eyestrain, people should not look at screens for as
long as they often do.
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b. remember the 20/20/20 rule: every 20 minutes, look at something
20 feet away for 20 seconds.
c. the human eye tires after staring at close objects, such as
computer monitors, for too long.
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d. the medical term for eyestrain is asthenopia, and is caused by the
contraction of the ciliary muscle.