Now, the Javal-Bull optometer permits of a quick determination of the value of the amplitude of accommodation in dioptries.
In using the optometer, find the place where vision of the dots is the easiest and most distinct.
Test with optometer, and in reporting use the number on the stem preceded by F for far-sightedness, and N for near-sightedness.
optometer op·tom·e·ter (ŏp-tŏm'ĭ-tər)
An instrument for determining the refraction of the eye.