The researchers found that 58 percent of people with no known vision symptoms when they went in for a routine eye exam actually had at least one significant change noted by their eye doctor.
In the majority of the cases, the diagnoses were relatively minor, like the need for glasses or contacts or an updated prescription for their eye gear.
Still, walking around with an outdated prescription isn’t exactly harmless: You’re more likely to experience eyestrain, headache, and dizziness, according to lead researcher Elizabeth Irving, Ph.D., professor of optometry and vision science at the University of Waterloo.
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