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20/20 vision. Vision 10/20. Vision 20/40. What do all these numbers really mean? Optometrists and ophthalmologists around the world have discovered the standard by which every person should be judged when diagnosing their visual condition. Vision 20/20 is known as the standard, or how a "normal" person sees. This means that when you stand 20 feet from your eye chart, you will see what the average person should be seeing. The Optical Society of America states that a person with 20/20 vision can clearly identify a row of 9mm characters from 20 feet.
Did you know that to be considered legally blind (and also unable to drive) in the United States your vision is as bad as 20/200? A law-blind person with 20/200 vision must be close to 20 feet to locate objects that people with normal vision can detect from a distance of 200 feet. Therefore, a blind person legally needs a distance of two feet to discover letters on a standard eye chart 20 feet away. *
So if you have 20/40 vision, that means you can see as much as the average person can see 40 feet from an eye chart. To illustrate this further, if you have 20/40 vision and there is a normal person 40 feet from the outline and you are within 20 feet of the outline, then you both see the same amount of detail on your eye chart.
The opposite applies if you have a 10/20 vision. If you have 10/20 vision, then you are above average! You are better than the "normal" person and have a better vision than normal or normal. If you have 10/20 vision, you can see at 20 feet what the average person would see 10 feet from the eye chart.
Want to test your vision now? the cold. Let's do it. Below is an image called the "Snellen Eyesight Test". Here are the steps you can take right now while sitting at your computer to test your vision.
Measure the length of the largest "E" in the table and multiply it by 2,838. For example, if you measure E at 2 inches, you will need to sit about 5'8 '' from the screen. Move your seat back and once you are at an appropriate distance, start reading the letters starting from the top. When you get to a line of characters that you can't read, the top line is your approximate optical power. Anything worse than 20/20 we can fix it! Contact us today!
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