The Monoyer eye chart is available in 2 versions:
Reading card Monoyer 3M: ends on ZU
Reading card Monoyer 5M: ends on NXV

The Optometric Reading Card was invented by Ferdinand Monoyer.
This eye test is widely used in ophthalmology and medical practice, to measure visual acuity
from a distance by reading directly from a distance of 3 metres.

Based on the principle of the Snellen scale, Monoyer's optometric scale has
10 lines of capital letters of increasing size. Each line corresponds to 1/10 of visual acuity.

The typography and graphic representation of the letters on the wall test prevent confusion
between letters of similar shapes.