How do you convert between contact lens prescription to 20/20 vision?
Unfortunately there is not conversion factor for the two, since seeing 20/20 is subjective and differs from person to person. But there are estimates - for a prescription as high as yours the highest letter on the chart (the big E) is probably unreadable - this means that your vision is worse than 20/400 or >20/400. Hope this helps!
How do I convert my contact lens prescription into my unaided vision measurement (IE: 6/18 or [20/60])?
Because that is a frequently asked question, I prepared some charts for it. 20/60 is just a shade over 1 diopter of focus error, but we don’t know in which direction plus or minus, probably minus because your lens would try to compensate if it were plus.
What is the prescription for 20/20 vision?
I'm asking because I want to order frames just to wear, but they only come with the lenses in them. The website asks for a prescription, and I want to assume that my OD(S)-SPH, OD(S)-CYL, OD(S)-AXIS, OD(S)-ADD are all 0, since I know that I have 20/20 vision. Is this correct?
How do you convert a Contact lens Prescription into 20/20 form?
You can't convert prescription to acuity, they are two different things. Acuity must be measured. Next time you get an eye check, ask the doctor what your acutiy is.
How do I go about getting a prescription contact lense that are "20/20"?
The lenses aren’t 20/20 , they aren’t measured that way. Your vision , when corrected by glasses or contacts normally would give you 20/20 vision , which is good, normal vision.So, you need an eye exam to determine what prescription powers you need for contact lenses or glasses in order to see 20/20. Only an Optometrist or Ophthalmologist can determine that for you.Licensed Optician in Ontario, Canada since 1973
How is my vision on a 20/20 standard scale if my prescription is -1.75 on both eyes?
What you want to know is your visual acuity which is measured by what you can see on the eye chart without corrective lenses on. That is a very different measurement than the - 1.75 you need to bring you to 20/20 or better. There is no precise conversion for that , because it is apples and oranges , but that being said , MOST people with a - 1.75 under normal conditions would be around 20/100 to possibly 20/200 Only the Dr. who had you read the chart would have the precise results.
What does my contact lens prescription really mean?
Anything below 1.00 either +1 (for farsightedness) or -1 (for nearsightedness) can be attributed to stress in your life. ie...studied a bit too much for exams under bad light conditions, lack of sleep, bad reading habits (posture etc.). But should fluctuate back to your 20/20 vision when the stress condition is removed. This is for the sphere reading. Astigmatism (which is your cylinder and axis measurement) was taken because you wanted to get a fitting for your contact lens. That's why the optometrist mentioned you need lens...but those too are within and under the 1 variable. Its up to you if you want to get your contacts with prescription, but the lens with astigmatism usually cost more. And if you are careful with your vision and rest your eyes I think you probably don't need them. But just in case get regular eye checkups. Eat healthy, sleep do the things that keep your eye muscles happy (or drink a lot of carrot juice (good vit A for the eyes) etc and I think you would be fine. But I'm not a trained doctor, so if you want you should ask for a second opinion. But mostly I find that if your job/life doesn't require 20/20 vision (ie pilot) or 20/40 for driving (in the states) then you are safer not getting them, cause using glasses all the time or contacts can lead to worst eye strain and higher prescription, without solving what caused your eyes to strain in the first place. Hope this helps, and keep your eyes healthy! You're lucky to have close to 20/20 vision!
My contact prescription is -9.50, what would that convert to on the 20/20 scale?
The 20/20 scale as you put it , is the visual acuity measurement which is a different measurement than the prescription...so there is no conversion...it is two different things. With a prescription that strong, it is doubtful the Dr. even measured your visual acuity without correction because it is of no use to know. You are way beyond what a normal eyechart can determine. You are certainly worse than 20/1000 without glasses which is beyond any sense...that's why it is rarely measured. Your vision WITH correction is what is important , and hopefully you have at least 20/20
What prescription lenses would you need for 20/50, 20/60 and 20/70 vision?
There is no correct answer to your question. How bad your vision is does not correlate to the strength your lenses need to be on a 1-to-1, or any, set basis. Some people have 20/70 vision and can see 20/20 with only -2.00 lens, other people have better 20/30 vision and need -3.00 lenses to see 20/20. GENERALLY, the worse your vision, the stronger the prescription needs to be, but only in a broad sense. "Spherical correction" is the general strength, in diopters, of a prescription lens. There are two parts to your prescription, the near or far correction (sphere) and the astimatism correction. That is why you see prescriptions as 2 numbers on some contacts, example -1.50, -1.00. On glasses, you would see 3 numbers, the two already mentioned, plus the axis of the astigmatism in degrees, ex: -1.50, -100 x 180. Since making contacts with astigmatism correction is more expensive, people with low astigmatism can safely ignore that measurement and use a "Spherical equivalent" prescription.