Your supposed to be 20 feet away no matter what. to read these charts you take the smallest one you can read, and the bottom number of that one is how close most people have to be in order to read it so like 20/15 means you see at 20 what most see at 14 etc
Your supposed to be 20 feet away no matter what. to read these charts you take the smallest one you can read, and the bottom number of that one is how close most people have to be in order to read it so like 20/15 means you see at 20 what most see at 14 etc