In the survey, patients reported how often they replaced their contact lenses. By Maegan Hitti Health News Latest Eyesight News Beta-Blockers Tied to Higher Cataract Risk New Implantable Lens Corrects Nearsightedness Humans Can Develop Bat-Like Echolocation Test Before Corneal Transplant Improves Outcome Not All Sunglasses Are Created Equal Want More News. Sign Up for MedicineNet Newsletters. Adults who wear contact lenses. Patients wore various types of contact lenses.

45% wore silicone hydrogel lenses that should be replaced every two weeks, 39% wore silicone hydrogel lenses that should be replaced monthly, and 16% wore disposable lenses that should be replaced daily. The survey -- conducted in February by researchers at the Centre for Contact Lens Research at Canada's University of Waterloo -- included 1,654 U.S. That includes 59% of patients with. -- If you wear contact lenses, you might want to check your calendar. Overall, 40% kept their lenses beyond the maker's recommended date.

A new survey shows that 40% of contact lens wearers don't replace their lenses in keeping with lens makers' guidelines.