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Your eye doctor will give you instructions toward preventing these problems, and here are some contact lens safety tips to consider when wearing contacts. These lenses still require a prescription from an eye doctor, and that is because certain conditions make wearing contact lenses unsafe, and many patients require customized lenses that fit the shape and surface of their eyes. An eye doctor can use a number of tests to measure the eye’s surface for patterns and irregularities, and use that information to create lenses that will prevent the discomfort or worse associated with wearing contact lenses that do not fit. First, prescribing contact lenses requires a more thorough examination of the eye’s surface, which the lenses are constantly in contact with.