Twenty-Twenty Vision also mentioned as 20/20 vision is generally tested at a distance of 20 feet from the eye chart. If you have 20/20 vision, you can see the small letters; a person with normal vision can see 20 feet away from the eye chart.

Visual acuity is the medical term for sharpness of vision. It deals with the sharpness, or discrimination, of central vision, rather than the extent or clarity of peripheral vision. Refractive errors, which can be corrected with eyeglasses, are the most common cause of poor visual acuity. These include myopia, or nearsightedness; hyperopia, or farsightedness; and astigmatism. Myopia is a reduced ability to see distant objects clearly, hyperopia is a condition that initially causes difficulty in seeing nearby objects and progresses to affect distance vision, and astigmatism is blurred vision caused by abnormal curvature of the front surface of the cornea.

Types of Vision:
20/20 vision
If you have 20/20 vision, it means that when you stand 20 feet away from the chart you can see what the “normal” human being can see. In other words, if you have 20/20 vision your vision is “normal” — a majority of people in the population can see what you see at 20 feet.
20/40 vision
If your vision is 20/40, it means that someone with normal vision can see an object from 40 feet away distance, while you can see the same object from 20 feet distance.
20/15 vision
If your vision is 20/15, it is even better. What someone with normal vision sees 15 feet away, you could back up to 20 feet and see the same object.
20/10 vision
If your vision is 20/10, it is even better. What someone with normal vision sees 10 feet away, you could back up to 20 feet and see the same object.
6/6 vision
Most of the world (except the U.S., Britain, Canada, and few other places), use the metric system. 6/6 is the metric equivalent of 20/20; 6/12 is the metric equivalent of 20/40; 6/120 is the equivalent of 20/400; and so on.
20/400 vision
If your vision is 20/400, it means that someone with normal vision can see an object from 400 feet away distance, while you can see the same object from 20 feet distance.
20/200 is the cutoff for legal blindness in the United States.

Bellow is few steps to improve 20/20 vision.
Look up, down as far as you can repeat 4 times
Look right, left as far you can repeat 4 times
Look upper right, lower left as far as you can repeat 4 times
Look upper left, lower right as far as you can repeat 4 times
Don’t do this, 2-3 days after you have done the exercises listed above. Circle your eyes counter clockwise and clockwise 5 times
Squeeze your eyes tight for 3 seconds.
Put your arm up look then look at something 40 ft away.
Palm your eyes for 3 minutes

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