A contact lens is a synthetic lens that sits on the surface of the eye and helps correct vision problems like long-sightedness, short-sightedness, presbyopia and astigmatism.
Most contact lenses fall into one of two groups:
Contact lenses can correct most refractive errors including myopia (main use), hyperopia, astigmatism and presbyopia. Contact lenses also have certain therapeutic uses and are needed for bandage lenses, or even in some cases for drug delivery. Opaque contact lenses may be used to hide disfigurement of the cornea such as scars.There are cosmetic contact Lenses to change the colour of the eye.
Many lens designs are available to correct different types of vision problems: