An Auto Lensmeter or Lensometer, also known as a focimeter or vertometer, 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 confirm the correct mounting of lenses in spectacle frames. Lensmeters can also verify the power of contact lenses. A lensometer or lensmeter is used by eye care professionals to verify the prescription in eyeglass lenses. The device can also be used to make sure lenses are mounted correctly within a pair of glasses and is also used during the eyewear-making process to orient and mark lenses that have yet to be cut. Additionally, some of today's automatic lensmeters can also check the prescriptions of bifocal/progressive lenses, evaluate contact lenses, and analyze lenses for UV protective properties.