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Home > Archive > Lasik Eyes Surgery > July 2006 > Re: This guy had a scary complication in left eye, lost some vision, also poor night v
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Re: This guy had a scary complication in left eye, lost some vision, also poor night v
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| Ragnar 2006-07-23, 4:28 pm |
| Here we go again... you know a guy who is 20/5
Call the Guiness Book of World Records.
It is not possible.
That is like saying you know someone who can run 90 miles an hour. It
is not humanly possible.
On 22 Jul 2006 21:46:34 -0700, "Ace" <acemanvx@yahoo.com> wrote:
>Who cares about the 20/8 estimate, its totally wrong. Like I said, I
>have a friend online who is between 20/7 and 20/6 and he has a friend
>who is 20/5.
>
>
>Let me google it.
>
>
>20/20 is considered normal vision. 20/10 is twice as good. Perfect
>vision is about 20/5 which is the limit of resolution of photoreceptors
>in the retina and so called diffraction limit for the optical system of
>the eye. For all practical purposes 20/10 could be considered perfect.
>
>
>Our eyes should be able to separate objects that are as close as 0.3
>arcminutes apart.
>Our eyes have imperfections in the cornea and lens that reduces the
>resolution to a practical limit of about 1 arcmin-a factor of about
>3.
>
>
>My comments: This means a 20/15 person may have "perfect" vision devoid
>of the tiniest refractive errors or he has mild hyperopia that can be
>fully accomodated. Yet his high order aberrations keep him from the
>best possible vision of 20/5 or even 20/4 depending on his retina and
>optics.
>
>
>Several other websites show some humans can be capable of 20/5 if you
>remove all their aberrations
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