Lensmeter

 A lensmeter , or lensometer is an ophthalmic instrument. It is mainly used by optometrists and opticians for verifying the correct prescription in a pair of eyeglasses.

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The parameters used by a lensmeter is derived from the prescriptions written by an ophthalmologist or optometrist, being sphere, cylinder, axis, add, and in some cases, prism. The lensmeter also used to check the accuracy of progressive lenses, and is capable of marking the lens center and various other measurements critical to proper performance of the lens.

See also

• Vertometer, includes external link to picture