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Ophthalmic Technician

Category - Lensometry and Spectacle Skills

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What is used to measure the vertex distance of a pair of eyeglasses?

Caliper
Geneva lens gauge
A small millimeter ruler
An index card

Explanation

Answer: C - A small millimeter ruler

A small millimeter ruler is used to measure the vertex distance of a pair of eyeglasses. The vertex distance is the distance from the front of the cornea to the back surface of a lens. This is important because lenses have a different power depending on how close or far they rest from the cornea.

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Ophthalmic Technician

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