What Is the Eye Test for Reading Glasses?

What Is the Eye Test for Reading Glasses?

What Is the Eye Test for Reading Glasses?

The typical test for reading glasses is a diopter test. This tests determines the corrective strength needed to read small text at a normal, comfortable distance without straining.

Diopters are the units which measure the corrective strength of reading glasses. Corrections are measured in increments of 0.25. A larger number indicates a strong correction.

The diopter test, which can be found for free online, shows the different corrective strengths on the left. A sentence is printed beside each strength. The size of the font of the sentence corresponds with the amount of correction needed in order to read it comfortably.