How Do You Convert a Contact Lens Prescription into 20/20 Form?
April 9th, 2010 | See the Top Answers to this Question Below
I have bad eyesight. My contact strength is a -12.50. What would that be in terms of 20/20 eyesight?
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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.
You put on your lenses and read an eye chart. This gives you your visual acuity.
There is no way to convert that power to a visual acuity measurement.
I presume you mean your vision without contacts.
Those two things are complete different measurements.
Your visual acuity with a refractive error like that is only measurable to some extent by counting fingers held up in front of your face.
Without glasses or contacts on you would probably be less than 20/2000….which doesn’t even make sense anymore.
Your vision WITH contacts on is the important measurement , and you are probably 20/20 or close to it.
Don’t be concerned about how bad your vision is without correction , it’s how well you see WITH correction that counts.