A lensmeter or lensometer, also known as a focimeter or vertometer,[1][2] is an ophthalmic instrument. It is mainly 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. Lensmeters can also verify the power of contact lenses, if a special lens support is used.http://www.zbxyoptics.com/refractometer/
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