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what does my eye prescription mean calculator?

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How can I calculate how much vision I have using an eyeglass prescription?
Right Power(SPH)-5.50    Right Cylinder-1.50    Right Axis180
Left Power(SPH)-5.50    Left Cylinder-1.00    Left Axis180

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asked Feb 12 in Health by smyadmin

5 Answers

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The concept "how much sight I have" is not the concept that medical professionals think about.  If the glasses give you normal vision, then you have 100% of your vision. If the glasses could not correct you to as good as that, then that is the concept of "how much vision I  have".  We don't calculate "how much vision" without glasses.

But to answer your question somewhat, you probably are seeing about 20/400 in each separately without squinting. I hope this helps.
answered Feb 12 by Richard Hom
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Visual acuity (how sharply you can see) and eyeglass prescription are 2 completely different things, even though they are related in the sense that generally, the higher the myopia or other refractive error, the poorer the visual acuity at particular distances.

So you cannot calculate visual acuity from an eyeglass prescription.

For example, if you wear your glasses, your vision will be 6/6 in the distance. If you don't wear your glasses, then it would be blurry in the distance, but would still be pretty good close up.
answered Feb 12 by Por Yong Ming
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When you open your eyes and look at something, can you see it, no matter how out of focus it is? Then you have eyesight. If you can't see anything, you have no eyesight. Sight isn't a matter of degree -- you can either see, or you can't. Any eyesight is better than none.

An eyeglass prescription is meant to correct the abnormalities in your vision due to issues with the lens and the shape of your eyeball.
answered Feb 12 by Lorri Robinson
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My smart aleck response might be that you have much better vision than you think, the world is just to big for you.  Your vision out to 8 inches is probably better than mine.
Assuming that other than some toricity and eyeballs that are roughly 2 mm longer than optimal for the optical power of your crystalline lens cornea combination, Borish's book Refraction has several formulae that predict what you Snellen visual acuity should be.  Your uncorrected vision probably is somewhere between no light perception to 20/600 without correction.  I could correct to anywhere between no light perception to 20/12 with correction.  My preferred chart measures no better than 20/15.  I do have an antique Classon projector that could measure as  good as 20/6 (if I remember correctly.)
answered Feb 12 by Tom Reagin
0 votes
I'm not sure exactly what you mean by this question so I will answer it as if you are asking how well can you see.

The strength of a prescription gives no indication at all as to how well a person can see with their glasses any more than the size of their shoes indicates how fast they can run. A spectacle prescription shows only what lenses will give that person the best Visual Acuity of which they are capable, just as a shoe size merely tells what is the best fit for them. An athlete can run faster than a non-athlete, and much faster than an old person or someone with a broken leg, even though they may all take the same shoe size.

A prescription like yours (with minus rather than plus lenses) shows only that the person is moderately sort sighed (more than most but not as bad as some) and can definitely not see well enough to drive a car without glasses (or contact lenses). If there are no other problems with the eyes then the person will have very good near Vision and will be able to read and see fine details better than most people as long as they get close enough to things (a few inches).

With glasses on you may see as much as anyone if your eyes are healthy or only poorly if you have problems such as cataracts. A spectacle prescription gives no indication of its effectiveness and although the person who assesses it (optician or doctor) will record in the notes the Visual Acuity that it gives their patient this detail is not part of the prescription and is not usually given unless specifically requested.
answered Feb 12 by Don Berrington

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