lensometer
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lens·om·e·ter
(lenz-om'ĕ-tĕr),An instrument to measure the power and cylindric axis of a spectacle lens.
Synonym(s): focimeter, vertometer
[lens + G. metron, measure]
lensometer
(len-zom′ĕt-ĕr) [ lens + -meter]A device that measures the refractive power of a lens.
focimeter
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.
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Fig. F8 Focimeter (Shin Nippon)