On Sun, 23 Dec 2018 18:38:19 -0600, hleopold
wrote:
On Dec 23, 2018, Paul Schlyter wrote
(in et):
On Sat, 22 Dec 2018 20:09:17 -0500, wrote:
My corrected vision in my left eye is 20/25, i.e., very good.

That's the same as 0.8 right? And full visual acuity would then be
25/25? Or 100/100 etc if you prefer that. Or just 1.0

20/20 is, as I understand it, perfect vision. Mine is 20/400 in
the
right eye uncorrected, corrected to 20/15. left is somewhat worse,
but
corrected to 20/15 also. Or it used to be, these days I am probably
more
20/20 or slightly worse. Plus they have to correct for the bad
astigmatism I
have in both eyes.

If the numerator is always 20, what does this 20 mean? Is 20/20 in
some way different from, say, 25/25 or.30/30?