Contact perscription?

Question

If my contacts are -5.00, how do I find out what my vision in terms of the system using 20/20, 20/40, etc.?

Answer 1

Funny how come this has been asked so often for the last week.

There is no way to tell what the visual acuity ( 20/20 value) is just by seeing the prescription.

The only one who knows is the Doctor, when he did those measurements. He would have that in his files.

Answer 2

you ask the doctor who gave you the prescription

Answer 3

Your visual acuity will be 20/400 (approximately.)

Answer 4

They're two different measurements and cannot be determined from your prescription.

Also note that for contact prescriptions, the optometrist prescribes ones which are less powerful than your actual prescription (-5.00) because the lens are close to your eyes compared to glasses.