concave spherical lens

concave spherical lens

Etymology: L, concavare, to make hollow; Gk, sphaira, ball; L, lentil

a lens with curved, depressed surfaces that cause light rays to diverge. It is used for the management of myopia (nearsightedness).

concave spherical lens

A lens formed of prisms with their apices together (thin at the center and thick at the edge), used for correcting myopia.

See also: lens