10 April 2010

Que Significa? - 20/20 Vision

In the USA 20/20 is considered normal eyesight.  Meaning that you can resolve (see) at 20 feet what the average person can see at 20 feet.  A smaller denominator (number on the bottom) denotes superior vision.  20/10 is extremely good, while babies have 20/400 vision at birth, improving to 20/20 by age 6.  A hawk has 20/2 vision.  

If you are reading this, you are probably 2 feet from the screen.  A hawk could read this from 20 feet away.  Take 7 steps back and see how yours compares.

{read the long version}