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.

Fig. F8 Focimeter (Shin Nippon)

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References in periodicals archive ?

Lensometer measurements [lambda], [mu], and [alpha] become matrix entries in (3) and (4).

Tolerance and nature of residual refraction in symmetric power space as principal lens powers and meridians change

The lenses then are taken to the lensometer, and the optical centers are dotted for proper placement of the "block." The lenses then are "edged" and safety-beveled to prevent flaking and sharp edges.

Battlefield vision: eyeglasses for the soldier

The outputs from a keratometer or a lensometer are very closely related to eigenvalues and eigenvectors of an appropriate matrix.

Paraxial ocular measurements and entries in spectral and modal matrices: analogy and application

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