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… ...

At least once in your life, you must have squinted at the eye chart at the doctor’s office or DMV, trying to make out the blurry bottom line. Turns out, there’s some very precise math that ...

Two commonly used tests are Snellen and random E. Snellen. The Snellen test uses a chart of letters or symbols. You’ve probably seen the chart in a school nurse’s office or eye doctor’s office.

Charts were viewed from a distance of 4 m unless the subject made any incorrect responses on the top line of a given chart–indicating an acuity worse than +1.00 logMAR (6/60 Snellen).