Saturday, December 22, 2012

What is 20/20 Vision?

Perfect vision is described as 20/20 vision.
20/20 vision means your eye can see what the average human eye sees clearly at 20 feet.

If your eye can perceive objects at 20 feet that the average eye must be at 15 feet to see as clearly, then that eye has 20/15 vision. You should be so lucky — most Americans are nearsighted or farsighted to some degree. That is, either they see near objects clearly but not distant objects (nearsightedness, or myopia) or vice versa (farsightedness, or hyperopia).

No comments:

Post a Comment

Related Posts Plugin for WordPress, Blogger...