A contact lens is a thin lens that is placed on the cornea of the eye. Contact lenses are usually prescribed by an eye care professional to correct refractive errors (nearsightedness, farsightedness, astigmatism). Contact lenses can replace eyeglasses.
Medical devices, such as contact lenses, fall under the scope of the U.S. Food and Drug Administration. For more information, please visit their website:
U.S. Food and Drug Administration, Contact Lenses
For more information from other health sites, please visit the following webpages:
American Optometric Association, Contact Lenses
American Academy of Ophthalmology, Contact Lenses
For general information on refractive errors from the NEI, please visit the following webpage:
Facts About Refractive Errors