vertometer
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Vertometer — A vertometer is an ophthalmic bench instrument used to measure dioptric power of a lens. It differs from a lensmeter or lensometer which is a general dispensary tool for opticians to verify spectacle prescriptions at the laboratory. A vertometer … Wikipedia
Lens clock — A lens clock is a mechanical dial caliper that is used to measure dioptric power of a lens. It is a specialized version of a spherometer. A lens clock measures the curvature of a surface, but gives the result in diopters, assuming the lens is… … Wikipedia
Dioptre — This article is about the unit of measure in optics. For other uses, see Diopter (disambiguation). A dioptre, or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal… … Wikipedia
Optical instrument — An optical instrument either processes light waves to enhance an image for viewing, or analyzes light waves (or photons) to determine one of a number of characteristic properties. Contents 1 Image enhancement 2 Analysis 3 Other optical devices … Wikipedia
Spherometer — A spherometer is an instrument for the precise measurement of the radius of a sphere. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens.The usual form consists of a fine screw moving… … Wikipedia
Optical power — For the power of light, see Radiant flux and Luminous flux. Optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or… … Wikipedia
Lensmeter — The parameters used by a lensmeter is derived from the prescriptions written by an ophthalmologist or optometrist, being sphere, cylinder, axis, add, and in some cases, prism. The lensmeter is also used to check the accuracy of progressive lenses … Wikipedia
lensometer — An instrument to measure the power and cylindrical axis of a spectacle lens. SYN: focimeter, vertometer. [lens + G. metron, measure] * * * lens·om·e·ter len zäm ət ər n … Medical dictionary
vertómetro — Eng. Vertometer Ver frontofocómetro de proyección … Diccionario de oftalmología
