I'm not drawing distinctions between "normal" and "perfect" here. My point is that 20/20 refers to what you can see at a distance of 20 feet, which is differen

I'm not drawing distinctions between "normal" and "perfect" here. My point is that 20/20 refers to what you can see at a distance of 20 feet, which is different from what you can see at a distance of 2 feet. Huge numbers of senior citizens have 20/20 or better vision but still can't read a computer monitor without reading glasses.