Lensmeters (Auto and Manual)
An auto or manual lensmeter, can also be referred to as a focimeter, lensometer or a vertometer. As an ophthalmic instrument, it is generally used by optometrists and opticians. Its uses are to ensure the correct prescription is used in a pair of glasses in order to properly align and mark uncut lenses. It also confirms the correct mounting of lenses when they are fitted into spectacle frames. Lensmeters may also verify the power of contact lenses, a special lens support will need to be used.
The lensmeter can also be used to check the accuracy of progressive lenses and often is more than capable of marking the lens and other measurements which could be deemed critical to proper performance of the lens. Using a lensmeter prior to the examination of the eye can also aid in obtaining the previous prescriptions the patient was given.