Do You Have 20/20 Vision? August 12, 2008
Posted by SonjaHelga in : Trivia , 6comments
photo credit: e36bursche
An eagle has 20/2 vision. That’d be nice!
Interesting Fact: About half of all American adults don’t have the 20/20 vision physicians consider optimal because they are nearsighted, farsighted, or have an irregular corneal curve known as astigmatism, a large, new study reports.
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What is 20/20? Or the Snellen Eye Chart? A quick summary for your info.
A visual acuity of 20/20 is frequently described as meaning that a person can see detail from 20 feet away the same as a person with normal eyesight would see from 20 feet. If a person has a visual acuity of 20/40, he is said to see detail from 20 feet away the same as a person with normal eyesight would see it from 40 feet away. It is possible to have vision superior to 20/20: the maximum acuity of the human eye without visual aids (such as binoculars) is generally thought to be around 20/10 (6/3) however, recent test subjects have exceeded 20/8 vision. Recent developments in optometry have resulted in corrective lenses conferring upon the wearer a vision of up to 20/10. Some birds, such as hawks, are believed to have an acuity of around 20/2; in this respect, their vision is much better than human eyesight.
