Optical pH Measurement of Contact Lens Solutions Affirming Why Product Expiration Dates Matter By various estimates, more than 125 million people worldwide are contact lens wearers, with about one-quarter of the total in the U.S. Contact lens popularity has grown considerably as lenses have become safer and more effective. Contact lens safety comes with a caveat: to avoid eye irritation and infection, lens wearers must exercise proper care and handling of lenses and lens accessories. Yet in a 2014 study of contact lens wearers in the U.S., the Centers for Disease Control and Prevention reported that a remarkable 99% of lens wearers engaged in at least one hygiene-related risk behavior, from sleeping overnight in their lenses to not replacing contact lens cases frequently enough. In this ap

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