Contact lenses work by providing a clear optical surface directly on the eye, which corrects refractive errors and provides vision correction. Advances in lens design, materials, and manufacturing methods have made it possible for most people to comfortably wear contact lenses, including those with astigmatism who can now wear Toric Contact Lenses. Contact lenses, even cosmetic ones, are considered a prescription device and require a current contact lens prescription from an eye doctor.