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What is normal vision acuity?

Eye charts can be configured in various ways, but generally, if during an eye test you can read the big E at the top but none of the letters lower than that, your vision is considered 20/200. That means you can read at 20 feet a letter that people with "normal" vision can read at 200 feet. So at 20/200, your visual acuity is very poor.

Can visual acuity be improved?

If visual acuity is less than 20/20, the examiner will try different lenses to learn if a change of your glasses or contact lens prescription will improve visual acuity (a process known as “refraction”). The pinhole test is often used at the beginning of refraction as a quick test.


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