convex spherical lens


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convex spherical lens

Etymology: L, convehere, to bring together; Gk, sphaira, ball; L, lentil
a lens that has sides that curve outward like a section of the exterior of a sphere and that brings light to a focus. It is used in the treatment of hyperopia (farsightedness).

convex spherical lens

A lens formed of prisms with their bases together (thick at the center and thin at the edge), used for correcting hyperopia.
See also: lens