Snellen chart that I have seen uses Courier. Maybe there are more types, using other fonts.

Snellen chart that I have seen uses Courier Bold. Maybe there are more types, using other fonts.

AFAIK, there is no standard typeface for these charts, and many use custom designed letters. However, Rockwell would be a good choice to emulate the typical slab-serif that appears on them.

- Lex

Awesome Thanks