1Problems with contact lenses or lens care products could result in serious injury to the eye. Proper use and care of your contact lenses and lens care products, including lens cases, are essential for the safe use of these products.2 Eye problems, including sores or lesions on the cornea (corneal ulcers) can develop very rapidly and lead to serious consequences including loss of vision. 4The risk of an infected sore or lesion on the cornea (ulcerative keratitis) is greater for people who wear extended wear contact lenses than for those who wear daily wear lenses. 5The overall risk of ulcerative keratitis may be reduced by carefully following directions for lens care, including cleaning the lens case. 6The risk of ulcerative keratitis among contact lens users who smoke is greater than among nonsmokers.