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Ophthalmic Assistant

Category - Lensometry and Spectacle Skills

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Which is a handheld instrument that measures the surface power of a spectacle lens in diopters?

Keratometer
Lensometer
Geneva Lens Clock
Tonometer

Explanation

Answer: C - Geneva Lens Clock

The Geneva Lens Clock is a handheld instrument that measures the surface power of a spectacle lens. A lens clock measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.

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