likelihood of 20/20 or better?

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likelihood of 20/20 or better?

Postby ZinMe » Fri Apr 13, 2007 6:56 am

I am getting ready for PRK surgery and tonight I was reviewing some search results on the likelihood of achieving good vision with PRK.

A few references mentioned that candidates with less than -6.0 myopia, are highly likely to get 20/20 vision, (90 percent) but at myopia levels higher than -6.0, 20/40 is more likely.

My stats are:

Pupil 7.0/6.7
Thickness 490/498
Perscription -9.0 / -8.76

My current vision with proper correction is 20/20 in one eye and 20/15 in the other.

If I wind up with 20/40, which sounds like the most likely outcome, how much worse than 20/20 is that? I don't fully understand what those numbers mean.

Thanks,
Dave
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Postby kellymasonmom » Fri Apr 13, 2007 1:06 pm

I think I understand it. 20/20 is "normal vision". If you are left with 20/40 vision it means that when looking at an object, what people with normal vision can see at 40 feet-you have to be 20 feet away to see the object.
I also found this article on the internet that you might find interesting:

In Diopters 20/something
-------------------------------
-0.50 20/25 to 20/30
-1.00 20/30 to 20/50
-3.00 20/300
-4.00 20/400
-5.00 20/600
-6.00 20/800 "

I hope this helps.
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Postby lvziggy » Fri Apr 13, 2007 4:47 pm

Hi Dave. My prescription was 6.75 and 7.25, corneas were 512 and 514, pupils around 7, so not quite the same as yours but certainly over the magical number of 6. My surgeon told me I should be able to expect to see 20/20 within about 4 to 6 weeks after surgery. Right now I'm 20/30 in the eye that was done a month ago and 20/40 in the eye that was done 2 weeks ago. I still expect to see improvement. My first eye didn't reach 20/30 until about 3 weeks after surgery. Right now I see very well. Just looking at things in general is very clear. It's only when I try to focus on words in the distance that I can tell there is any difference between my eyes. I even see better than my husband who mostly doesn't bother to wear his glasses, but does if he's driving somewhere unfamiliar so he can read street signs. If this was the best vision I could expect I wouldn't be too upset since I see this well WITHOUT any glasses or contacts. But since I think it will still get better I'm very happy.

~Alison
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Re: likelihood of 20/20 or better?

Postby LasikExpert » Sun Apr 15, 2007 4:39 pm

ZinMe wrote:If I wind up with 20/40, which sounds like the most likely outcome, how much worse than 20/20 is that? I don't fully understand what those numbers mean.


Humans reach "optical infinity" when an object is more than about 20 feet (6 meters) away. This is the point at which the natural crystalline lens within the eye is not trying to focus to see an object and all objects beyond that point are in equal focus.

A "normal" sighted person sees an object at 20 feet with a certain amount of clarity. This is called 20/20, meaning an object 20 feet away seen with the clarity of an object 20 feet away. 20/40 means seeing an object 20 feet away with the clarity a normal sighted person would see the same object if it were 40 feet away. 20/15 means seen an object 20 feet away with the clarity a normal sighted person would see the same object if it were 15 feet away. 20/40 is good enough to drive, but you are going to notice the difference from 20/20 and especially from 20/15.

Your higher eyeglasss prescription indicates that you have a higher probability for regression. Some doctors will deliberately overcorrect a high myope so regression brings you back to plano (no refractive error). You may want to read about Lasik regression for more details.

Vision will be less than ideal during the healing phase while the eye is regressing and generally settling down.
Glenn Hagele
Volunteer Executive Director
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Lasik Info &
Lasik Doctor Certification

I am not a doctor.
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