Doctor insights on:
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
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
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
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
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
Ask your eye doc: But honestly there is not a table to convert this. ...Read more
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
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
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
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
See a doctor: To see what you need.Get a more detailed answer ›
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
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
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
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
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
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
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
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
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
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