Lensmeter

Vertometerlensometerfocimeter
[[Image:Lensmeter-2.png|thumb|300px|right|A simple lensmeter cross sectional view.wikipedia
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Optician

opticiansdispensing opticianoptical engineer
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.
The dispensing of eyewear requires the use of a focimeter, or lensometer, to verify the correct prescription in a pair of eyeglasses, properly orient and mark uncut lenses, and to confirm the correct mounting of lenses in spectacle frames.

Glasses

eyeglassesspectacleseyeglass
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.
A lensmeter can be used to verify the specifications of an existing pair of glasses.

Lens clock

The actual power, as read by a vertometer or lensometer, might differ by as much as 0.1 diopters.

Antoine Claudet

Antoine Jean Francois ClaudetClaudet
In 1848, Antoine Claudet produced the photographometer, an instrument designed to measure the intensity of photogenic rays; and in 1849 he brought out the focimeter, for securing a perfect focus in photographic portraiture.
In 1848 he produced the photographometer, an instrument designed to measure the intensity of photogenic rays; and in 1849 he brought out the focimeter, for securing a perfect focus in photographic portraiture.

Optical power

Contact lens

contact lensescontactscontact lense
Lensmeters can also verify the power of contact lenses, if a special lens support is used.

Ophthalmology

ophthalmologistophthalmicoculist
A lensmeter or lensometer, also known as a focimeter or vertometer, is an ophthalmic instrument. The parameters appraised by a lensmeter are the values specified by an ophthalmologist or optometrist on the patient's prescription: sphere, cylinder, axis, add, and in some cases, prism.

Optometry

optometristoptometristsDoctor of Optometry
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. The parameters appraised by a lensmeter are the values specified by an ophthalmologist or optometrist on the patient's prescription: sphere, cylinder, axis, add, and in some cases, prism.

Eyeglass prescription

prescriptionprescription glasseseyeglass prescriptions
The parameters appraised by a lensmeter are the values specified by an ophthalmologist or optometrist on the patient's prescription: sphere, cylinder, axis, add, and in some cases, prism.

Progressive lens

multifocalprogressive lensesProgressive addition
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.

Eye examination

eye exameye testexamination
It may also be used prior to an eye examination to obtain the last prescription the patient was given, in order to expedite the subsequent examination.

Herman Snellen

Hermann SnellenSnellenDr. Hermann Snellen
In 1876, Hermann Snellen introduced a phakometer which was a similar set up to an optical bench which could measure the power and find the optical centre of a convex lens.

Optical table

optical benchOptical breadboardbreadboard
In 1876, Hermann Snellen introduced a phakometer which was a similar set up to an optical bench which could measure the power and find the optical centre of a convex lens.

Cardinal point (optics)

focal planenodal pointoptical centre
In 1876, Hermann Snellen introduced a phakometer which was a similar set up to an optical bench which could measure the power and find the optical centre of a convex lens.

Refractive error

refractive errorsrefraction errorametropia
In 1922, a patent was filed for the first projection lensmeter, which has a similar system to the standard lensmeter pictured above, but projects the measuring target onto a screen eliminating the need for correction of the observer's refractive error in the instrument itself and reducing the requirement to peer down a small telescope into the instrument.

Corrective lens

corrective lensesreading glasseslenses