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What does 20/20 Mean?







  Think of it this way: If you have 20/40 vision, what a normally sighted (20/20) person can see from 40 feet away, you'd have to walk up to 20 feet away to see.

<--- Mouseover the numbers for an approximation
of uncorrected vision levels.

The reason we use 20 is that 20 feet is a good approximation of optical infinity, or that distance beyond which the eye's focus is completely relaxed. Some people substitute say 6/6 instead, because 20 feet is roughly 6 metres.

What's an Optometrist?

Optometrists, ophthalmologists and opticians all provide eye care services. It is important to understand what each of the "three O's" is qualified to do.


Opticians fit, supply, and adjust eyeglasses and contact lenses which have been prescribed by an ophthalmologist or optometrist. They cannot examine or test the eyes, or prescribe glasses or drugs.


Optometrists (O.D.'s) generally have a bachelor's degree in Science plus 4 years of graduate training in a school of optometry. They are trained to diagnose eye abnormalities and prescribe, supply, and adjust eyeglasses and contact lenses. Optometrists can use drugs to diagnose eye disorders. Currently, all but one of the United States and two of ten Canadian provinces allow the use of certain therapeutic drugs for limited applications. An optometrist may refer patients to an ophthalmologist or other medical specialist in cases requiring medication or surgery.


Ophthalmologists (M.D. or D.O., Doctor of Osteopathy) are medical doctors who specialize in the diagnosis and treatment of eye diseases. They can also prescribe eyeglasses and contact lenses. Ophthalmologists can prescribe drugs and perform ocular surgery.

See Clearly. Check Yearly!
(519) 376-EYES (3937)
1701 3rd Ave. E., Owen Sound
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