A lensmeter or lensometer, also known as a focimeter or vertometer, is an ophthalmic instrument used by optometrists and opticians to verify the correct prescription in a pair of eyeglasses, to properly orient and mark uncut lenses, and to confirm the correct mounting of lenses in spectacle frames.
A lensmeter or lensometer, also known as a focimeter or vertometer, is an ophthalmic instrument used by optometrists and opticians to verify the correct prescription in a pair of eyeglasses, to properly orient and mark uncut lenses, and to confirm the correct mounting of lenses in spectacle frames.