RGPs are the successor to old-fashioned hard lenses, which are now virtually obsolete. RK Surgical procedure where cuts are made in the cornea in a radial pattern, to flatten the cornea and correct myopia. The outer coat of the eyeball that forms the visible white of the eye and surrounds the optic nerve at the back of the eyeball. A part, as in the near-vision portion of a pair of bifocals. SPF Number representing the amount of sun something blocks.
Crossed eyes are one type of strabismus.
A type of metal alloy that is very strong. Eyeglasses made of titanium are lightweight and durable and often hypo-allergenic. A lens design with two different optical powers at right angles to each other for the correction of astigmatism. The invisible part of the light spectrum whose rays have wavelengths shorter than the violet end of the visible spectrum and longer than X rays. UVA and UVB light are harmful to your eyes and skin.