American Board of Opticianry (ABO) Practice Test 2026 - Free ABO Practice Questions and Study Guide

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What does a distometer measure?

The characteristic of a minus lens

The limbus in conjunction with the cornea and sclera

The blue portion of light on the visible spectrum

The vertex distance

A distometer is a tool used to measure the vertex distance of a lens. The vertex distance refers to the distance between the back surface of a lens and the cornea of the eye. This distance is important in determining the proper fit of a lens and ensuring optimal visual acuity. The other options are incorrect because they refer to specific characteristics or parts of the eye, rather than measuring distance.

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