What does the number on my contact lenses translate too?

Question

I have a -2.00 reading, and i know it can't be that bad because my vision isn't horrible. But can someone guesstimate what my vision is out of 20. (Eg 70/20 or whatever it may be) Thank you

Answer 1

The numbers are not only the strength of your vision but also the circumference of your eyeball.

Answer 2

Power of contacts cannot be used to calculate visual acuity.  If you mean your vision without glasses, a rough estimate would be between 20/80 and 20/200.

If you mean with glasses or contacts, even a rough estimate is not possible.

Answer 3

-2.00 is moderate near-sightedness, meaning you can't see far away and generally can't meet driving requirements without correction.  The prescription also does not correlate directly with your uncorrected acuity, but a ballpark estimate is 20/80 to 20/100

see:  http://www.mdsupport.org/library/acuity....

Answer 4

The 20 / 20 number is a complete different measurement than the prescription.

The 20 / 20 value is your visual acuity, that could be affected by several factors, but assuming your eyes are normal, healthy , no asigmatism or anything else, then it would be approximately 20/80

You almost had it right in your example....lol

Which means you have to be at 20 feet to see an object that a normal eye can see at 80 feet...without your contacts on.

But, you are most likely 20/20 or better with your contacts on.