Question 1

is there a way to determine my visual acuity from my contact prescription?

Accepted Answer

No.: The contact lens prescription can give you an idea of the degree of nearsightedness, farsightedness, or astigmatism you may have, but it does not let you know your visual acuity. Generally, the higher the number in nearsightedness (myopia), farsightedness (hyperopia), or astigmatism, the worse the acuity will be. However,  your pupil size, cataract, retinal problems can also affect your vision.

Question 2

can you determine visual acuity by looking at prescription?

Accepted Answer

No: There is not a direct relationship between Snellen acuity (like 20/20 or so) and the diopters printed on an eyeglass prescription which is the formula used by the optical shop to make your glasses.

Question 3

will visual acuity always determine eyeglass prescription?

Accepted Answer

No, not always: Visual acuity is a measure of how  well you see. In most cases this reflects on what your prescription might be but it can't estimate it exactly.  There are many other factors that determine how well you see: if your retina is healthy and if there are other problems with your cornea or lens.  It's possible to have poor visual acuity and yet have no need for glasses.

Question 4

please answer! what prescription for 20/40 visual acuity?

Accepted Answer

Depends: I am guessing that your vision uncorrected is 20/40 (not too bad).  The prescription to correct this depends upon how it got there.  You could be myopic, hyperopic or have some degree of astigmatism.  Each of these would be a different prescription..  See your ophthalmologist to get the proper one.

Question 5

what does the sphere of my prescription say about my visual acuity?

Accepted Answer

Near-, or farsighted: If the first number (the sphere) on your prescription has a + notation before it, you are hyperopic (or farsighted), which means you can see better far away than up close (relatively).  If there is a - in front of that first number, then you are myopic (nearsighted) which means you see better up close than far away, relatively.

Question 6

how can you calculate visual acuity based on eyeglass prescription?

Accepted Answer

Simplistic: The simplistic answer is that a good optometrist/ophthalmologist knows what acuity corresponds  with what prescription.  I don't think you will find a formula to calculate this.

Question 7

my eyeglasses prescription is -8.00. what's a best guess at my snellen visual acuity?

Accepted Answer

With or without : It depends if you are corrected without any other eye issues then you probably can see 20/20.  You cannot see snellen chart without correction therefore there is no measure for it.   You probably can see near card at 4-6inches without correction.

Question 8

is there a way to convert contact lens power to a simple central visual acuity?

Accepted Answer

No: The relationship between lens power and the standard vision fraction like 20/20 is not linear.  These two items do not interconvert.

Question 9

is there a way to find out your visual acuity with an app or website?

Accepted Answer

Vision screening: A rough acuity can be gained from any number of apps/sites - search for vision/eye exam and follow the instructions.   If you are wondering about reading glasses - go to a place that sells them and they usually have a chart you can read with different readers on.   None of this is as good as  good eye exam.

Question 10

is there a way to find out your visual acuity without consulting your doctor?

Accepted Answer

null: There are a number of on-line tests of near and distance acuity. One good site is www.Preventblindness.Org/eye_tests/. There are also some vision test apps for your iphone or mobile devices.

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Is there a way to determine my visual acuity from my contact prescription

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Is there a way to determine my visual acuity from my contact prescription?

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Can you determine visual acuity by looking at prescription?

A member asked:

Will visual acuity always determine eyeglass prescription?

A member asked:

Please answer! what prescription for 20/40 visual acuity?

A member asked:

What does the sphere of my prescription say about my visual acuity?

A member asked:

How can you calculate visual acuity based on eyeglass prescription?

A member asked:

My eyeglasses prescription is -8.00. what's a best guess at my snellen visual acuity?

A member asked:

Is there a way to convert contact lens power to a simple central visual acuity?

A member asked:

Is there a way to find out your visual acuity with an app or website?

A member asked:

Is there a way to find out your visual acuity without consulting your doctor?

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