What is used to measure the vertex distance of a pair of eyeglasses?
A)Caliper
B)Geneva lens gauge
C)A small millimeter ruler
D)An index card

Question

Quizplus · Accepted Answer

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.

What Is Used to Measure the Vertex Distance of a Pair