Special Features:

A lensmeter or lensometer, is an ophthalmic instrument used 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; the lensmeters can also verify the power of contact lenses, when a special lens support is used; can measure the sphere, cylinder, axis, add, and in some cases, prism

Properties:

A device for determining the optical properties of a lens, such as dioptric power, axis, and angle between cylinders. It may have a device for marking the lens. Does not include measure, lens, ophthalmic.