A lensmeter or lensometer, also known as a focimeter[1], 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. Certain lensmeters also have the ability to examine contact lenses.
The parameters appraised by a lensmeter are the values specified by an ophthalmologist or optometrist on the patients prescription: sphere, cylinder, axis, add, and in some cases, prism. The lensmeter is also used to check the accuracy of progressive lenses, and is often capable of marking the lens center and various other measurements critical to proper performance of the lens.
See also
- Vertometer
- Lens clock
- Optical power
- Diopter
- Prism dioptre
- Corrective lens components
- Abbe refractometer
References
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