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it works
#5
I think this is how it goes:

20/20 means that the eye being measured can distinctly see letters/details of a certain height/size from 20 feet away - assuming that a normal eye also sees them clearly from 20 feet. Therefore that eye is 'normal' - IF 20/20 IS THE NORMAL STANDARD! But what if the normal standard is or should actually be 30/30? I.e., what if our general visual acuity has been slowly degrading?

20/40 would mean that your eye can only see clearly from 20 feet what a normal eye sees at 40 feet.
40/10 woud mean that your eagle eye can see clearly at 40 feet what a normal eye sees at 10 feet.

zarakiMaster Wrote:umm, can you explain what's 20/20 or 40/10? I've always thought 20/20 meant perfect sight.

4.0, to my understanding, was my diopeters measurement, something about the curvature of the lenses. and i thought 0.0 meant 20/20?
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Messages In This Thread
it works - by zarakiMaster - 04-26-2010, 11:54 PM
Re: it works - by Nancy - 04-27-2010, 08:00 AM
Re: it works - by Ares - 04-29-2010, 09:02 AM
Re: it works - by zarakiMaster - 05-02-2010, 01:11 AM
Re: it works - by JMartinC4 - 05-02-2010, 07:44 AM
Re: it works - by elanerajk30 - 05-19-2010, 01:40 AM
Re: it works - by Mzero - 06-02-2010, 06:54 PM
Re: it works - by clarknight - 06-09-2010, 03:59 PM
Re: it works - by Aura - 05-29-2011, 09:05 PM
Re: it works - by hammer - 05-30-2011, 02:52 PM
Re: it works - by Nini - 05-31-2011, 02:10 AM
Re: it works - by sway1 - 05-31-2011, 03:01 AM
Re: it works - by JMartinC4 - 06-03-2011, 09:34 AM
Re: it works - by clarknight - 09-17-2011, 07:57 AM