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Doctor insights on: 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?

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

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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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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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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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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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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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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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

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11 month old diagnosed with decreased vision from visual acuity test (teller). However, prescription test after dilating the eyes shows no prescription needed. Eye health is normal. Why this conflict?

11 month old diagnosed with decreased vision from visual acuity test (teller). However, prescription test after dilating the eyes shows no prescription needed. Eye health is normal. Why this conflict?

The teller cards: Give a good estimate of visual acuity in children. But, since it is testing the first reaction of a child when the card is presented, things like tiredness or distractions can affect the accuracy. The prescription measured after dilation is more of an objective measurement and can be done accurately. Continue follow up as your eye doctor recommended. Be well. ...Read more

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Is there a way to determine my visual acuity just from my contact lenses perscription?

Is there a way to determine my visual acuity just from my contact lenses perscription?

No: 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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Is there a way to convert contact lens power to a simple central visual acuity?

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

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

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

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. ...Read more

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

Visual chart: Many places have a visual chart on the wall and you can use this to determine your acuity. There are also charts on the internet which you can google and even an app or two. ...Read more

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Does computer vision syndrome affect my visual acuity?

Does computer vision syndrome affect my visual acuity?

Yes: Yes. The tears break up quickly in many patients with computer vision syndrome. This may reflect the lower blink rate and increased tear evaporation. Since the first thing light hits on our eyes is our tears, this can negatively impact your visual acuity. ...Read more

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What causes sensitivity to light changes for visual acuity?

Sensitive to light: Or photophobia is non specific. It can indicate problems with vision or if associated with headches and neck pain and fever can be from infection or meningitis.

You need to watch your symptoms if worsening go to the er.

If stable you might be able to go to an eye doctor instead.


Any visiual changes should be seen by your eye doctor. ...Read more

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Is it necessary to wear glasses if you have distant visual acuity?

No: If you see well at distance without glasses or contacts, that is fine. Not wearing glasses, even if needed, does not hurt or damage your eyes, if you are over 45, you may need reading glasses if you have good distance vision. Or, you can try monovision with a contact lens, with the non-dominant eye set for reading. Lasik in the non-dominant eye for reading might also be an alternative to explore. ...Read more

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How is visual acuity preserved in bitemporal hemianopia?

Nerve fiber pattern: Bitemporal hemianopia is the classic later stage vision pattern in advancing pituitary tumor. Generally the central fibers, which carry the best acuity are affected later in the condition. A great deal of vision loss would have to be ignored by someone with this condition before the nerve fibers for the central acuity start to drop out. ...Read more

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What is a visual acuity test?

Visual acuity: Acuity tests are standardized charts of various sized objects, usually letters or numbers, which delineate the limits of vision. This can be with or without eyeglass correction. This number can then be used to compare your best vision to others or to legal standards such as the level needed to get a driver's license. It also is used by researchers testing ways to improve vision. ...Read more

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How can I know my visual acuity?

Compare to normal: You can get a rough idea if you have 20/20 by comparing your sight with someone who has perfect vision (or perfect with correction). Both of you view something at the limits of clarity (a sign far away) and if you both read it well, then you are 20/20. To determine lesser sight, you will need an eyechart and a proper lane. ...Read more

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How to find out my visual acuity?

Testing: You can get a rough idea if you have 20/20 by comparing your sight with someone who has perfect vision (or perfect with correction). Both of you view something at the limits of clarity (a sign far away) and if you both read it well, then you are 20/20. To determine lesser sight, you will need an eye chart and a proper lane. It is best to have an ophthalmologist measure it for you. ...Read more

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What is combined visual acuity (combined vision)?

What is combined visual acuity (combined vision)?

Using both eyes: Combined visual acuity is the best that you can see with both eyes open. Though one would think that it can only be as good as the better seeing eye, often combined visual acuity is better than that. In other words, one can usually see better with both eyes open than with each eye individually. ...Read more

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I was wondering what does 6/5 visual acuity mean?

This is a metric: Measurement of vision. This would be a vision equivalent to 20/15 or better the 20/20. ...Read more

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What is the definition or description of: visual acuity?

Sharpness: 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 no doubt heard of. ...Read more

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Is there a rough visual acuity test that I can easily perform?

On line: You can "Google" Snellen acuity chart to get a rough idea of the vision. You can also compare the limits of your vision with someones vision who has known acuity. At your age, I assume that you have a driver's license and most likely have had to pass an acuity test to get that license approved. ...Read more

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What is the difference of having a visual acuity of 20/10 versus a 20/50 vision?

20/10 great vision: A person who has 20/10 vision sees an object at 20 feet that someone with "average" vision will only see clearly at 10 feet (better than average vision). With 20/50 vision, in many states you are not legal to drive unless it can be corrected. In other words a person with 20/50 vision will see at 20 feet what a person with average vision will see at 50 feet (worse than average vision). ...Read more