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An instrument to measure the power and cylindric axis of a spectacle lens.
Synonym(s): focimeter, vertometer
[lens + G. metron, measure]


(len-zom′ĕt-ĕr) [ lens + -meter]
A device that measures the refractive power of a lens.


An optical instrument for determining the vertex power, axis direction and optical centre of an ophthalmic lens (Fig. F8). The instrument can be either manual or automated. Syn. Lensometer (a tradename); vertexometer; Vertometer (a tradename). See lens measure; neutralization; back vertex power.
Fig. F8 Focimeter (Shin Nippon)enlarge picture
Fig. F8 Focimeter (Shin Nippon)
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The lenses then are taken to the lensometer, and the optical centers are dotted for proper placement of the "block.
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Notes are automatically updated with the numeric test results from devices such as auto-refractors and lensometers.