eye vision

[jorden12]

I have  a related quesstion to eye vision?

what is the different between 20/20 and 20/50 eye vision?

my dad age is 47

i will be happy if you answer back quicly

[Sandy Feldman, MD, MS]

Dear jorden12,

The numerator refers to the distance of the patient from the eye chart, usually 20 feet in the U.S. while the denominator refers to theability to resolve a character which subtends 5 minute of arc.  The larger the denominator, the larger size letter able to be resolved.

Dr. Feldman

Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California

[berrywoo]

Pretend you have a target. Now place the target 50 feet away. A person who has 20/20 vision would be able to see the target from 50 feet away. However, a person with 20/50 vision would have to move until s/he is standing only 20 feet away from the target.

Basically 20/20 vision is "perfect" visual acuity. A person with 20/20 will be able to see all things clearly within 20 feet. The higher the bottom number is the worse a person's vision is. There are also some people who have better than 20/20.

Also, keep in mind most people are able to have 20/20 vision with the use of glasses or contacts.

Hope this helps.