The eye doctor business has taken to heart, The late Herman Snellen's acuity chart. Working down line by line from that Capital E, The doctor could tell just how well we could see.

The angle created just as two lines of light become too close for our eyes to distinguish them is ... A perfect 20/20 score on an eye chart test doesn't mean you have perfect vision: Visual ...

In most modern Snellen Eye Charts, the middle bar is shorter. Vision specialists today use a version of the Snellen Eye Chart with 11 lines of letters. People are also reading… ...

People expect to see only the first few lines on traditional eye charts. Volunteers in an experiment who read a eye chart arranged in reverse order (the letters got progressively larger, ...