Vision chart

The vision chart, or eye chart, is a type of medical equipment. It is designed to test vision acuity. A specific kind of chart is named the Snellen chart. This chart has eight lines of block letters. With each line, the number of letters increases and the height of the letters decreases.

Vault-Tec supplies the Snellen vision charts to the Vaults prior to the Great War of 2077.

A standard clinic has at least one of these charts. An example of this chart is seen in the Vault 101 clinic on August 3, 2274 by the Lone Wanderer.