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Doctor insights on: What Does The Sphere Of My Prescription Say About My Visual Acuity

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

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

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. ...Read more

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Visual Acuity (Definition)

Visual acuity is the measure of the sharpness of vision. It is the most important measurement of eye function. In the us, the antiquated snellen visual acuity measurement is most often used. This is the "20/20" thing you have ...Read more


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

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

Near or far sighted: Sphere is the degree of near (minus power) or far (plus power) sightedness. For example, -3.00 sphere is 3 diopters of nearsightedness. -4.00 would be even more nearsightedness. Put a + in front of those numbers instead, and that would be farsightedness. Sphere does not include any astigmatism, a.K.A. Cylinder. ...Read more

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

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

Depends: As a rule of thumb, the strength of the prescription needed to correct 20/40 vision is about one diopter. It may be one diopter of correction for nearsightedness, farsightedness, astigmatism, or a mix of astigmatism with nearsightedness or farsightedness. Your eye doctor will perform a refraction to determine the exact prescription and an exam to rule out a medical cause for blurred vision. ...Read more

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Can you determine visual acuity by looking at prescription?

Can you determine visual acuity by looking at prescription?

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. ...Read more

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

No: There is not a direct correlation between the refractive numbers on an eyeglass prescription or the numbers on a contact lens prescription. You need a standardized chart and lane to get the actual acuity level. ...Read more

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Will visual acuity always determine eyeglass prescription?

Will visual acuity always determine eyeglass prescription?

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. ...Read more

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How can you calculate visual acuity based on eyeglass prescription?

How can you calculate visual acuity based on eyeglass prescription?

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. ...Read more

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How do I find out my visual acuity based on my eyeglass prescription? Is that possible?

How do I find out my visual acuity based on my eyeglass prescription?  Is that possible?

You don't: Your prescription is the power of the lens which gives you the best possible vision. It doesn't say anything about what that level of vision is. Your visual acuity is tested wearing your best correction. ...Read more

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

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. ...Read more