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is 20/20 twice as good as 20/40

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is 20/20 twice as good as 20/40
#1
or is it only the reading for the specific line on the snellen chart ?
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#2
It's twice as good as far as being able to read letters twice as small at the same distance, but that can be misleading. You run into those problems with something as subjective as vision.

Dave
Site Administrator

"Half of our funny, heathen lives, we are bent double to gather things we have tossed away." - George Meredith
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#3
so you cant see clearly twice as far when looking out onto a field for example
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#4
Maybe. Dave's right -- all it tells you is that you can see the lower chart letters (20 line instead of 40 line) at the 20-foot distance. When I became aware how freaked out I was about the whole idea of seeing into the distance, I started doing the chart at a closer distance, but just because I can see 4/10 (for example) doesn't mean I can see 20/50.

Don't get too hung up on the numbers. They're a good guide & indication of improvement, but they don't tell the whole story. It's like someone starting to work out & gaining weight & thinking they're dong something wrong, when what they're gaining is muscle. How do you feel? Are your eyes more relaxed than they used to be? Those matter as much as numbers on the chart.
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