What you may not know about contact lenses
The Federal Drug Administration clearly listed contact lenses as a prescribed device. In the United States, all types of contact lenses, clear or color, having an optical power or not, are available only by a valid prescription.
Contact lens wearers should have a contact lens eye examination at least once a year to check on the general eye health, especially corneal health, besides updating the contact lens optical power and fitting.
Contact lenses are most frequently used to correct refractive errors i.e. myopia, hyperopia, astigmatism, and presbyopia. Much less frequently, they are used for medical reasons such as relieving pain from the cornea, or molding a deformed cornea. In some cases, contact lenses are needed to create an artificial pupil; some are for covering up scars from trauma.
Whatever the reason for wearing contact lenses might be, it is necessary to ensure proper fitting and responsible handling in order to avoid eye health problems.