In the U.S., these products must be approved by the FDA before they can be marketed. Technically, this is any contact lens that is thrown away after a moderately short period of time. Vision impairment and even blindness can result. Compared with modern soft and rigid lenses, they are less healthy to wear long-term, since the material doesn't allow oxygen to reach the s high index Type of lens with a higher index of refraction, meaning that light travels faster through the lens to reach the eye than with traditional glass or plastic. To people with hyperopia, near objects are blurry, but far objects are in focus.
Many people believe the iris is the colored part of the eye.
Surgical procedure in which a tiny flap is cut in the top of the cornea, underlying corneal tissue is removed with an excimer laser, and the flap is put back in place. A fatlike substance that can collect on contact lenses, making them uncomfortable. Also called partial sight. Low vision usually results from an eye disease such as glaucoma or macular degeneration. An antioxidant that is found throughout the body, but is concentrated in the macula.