Day: October 4, 2025

You hear something like 20/20, 20/100 etc.

Visual acuity measures how well you can see fine details. It’s tested using an eye chart – the one with big letters on top and smaller letters below.

What two numbers mean:

Example	Meaning
20/20	You see at 20 feet what a normal eye can see at 20 feet (normal vision).
20/40	You be 20 feet away to see what a normal eye see at 40 feet (can drive with restriction).
20/200	You must be 20 feet away to see what a normal eye can see at 200 feet (Legal blindness- US)
20/800	You must be 20 feet away to see what a normal eye can see at 800 feet (Very poor vision, only large shapes)