CDC study shows 82 percent keep them in longer than recommended.
More than 99 percent of responding contact-lens-wearers engage in at least one risky behavior linked to eye infection, according to a survey by the CDC. Those behaviors included keeping contact lens cases longer than the recommended time (82.3 percent), topping off solution in the case rather than emptying the case before adding new solution (55.1 percent) and wearing contact lenses while sleeping (50.2 percent), according to a report in Healio.
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