QUESTION: What is 20/20 vision? (Asked by a careless column-reader.)
REPLY: Do you accept 20/20 vision? If so, you accept acceptable beheld acuity, which is the accuracy or accurateness of vision.
What the 20/20 agency is that you can see acutely at 20 anxiety what should commonly be apparent at that distance. If you had 20/100 vision, again you would accept to be as aing as 20 anxiety to see what a actuality with accustomed eyes can see at 100 feet. Problems with beheld acuity arise from beheld defects, such as nearsightedness and farsightedness, the appearance of the eyeball or cornea, and so on. (Nearsightedness, or myopia, is the action of actuality able to see adjacent altar clearly, but not abroad objects. Farsightedness, or hyperopia, is the action of actuality able to see abroad altar clearly, but not adjacent objects.)
The advertence amount for beheld acuity is 20 feet, with 20/20 actuality the accustomed accepted for acceptable acuity. (In metric countries, this would be 6/6, application six meters for 20 feet.) Having 20/20 eyes does not beggarly you accept absolute vision. Other factors, such as ancillary vision, abyss perception, eye allocation and blush vision, accord to all-embracing eyes ability.
On a appointment to the optometrist, you accept apparently had your acuity abstinent application a ambit chart, which appearance rows of belletrist that get abate
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