What Does 20 400 Vision Mean?

Answer

20/400 is a severe low vision. It is considered a severe visual impairment and the suitable prescriptions for eyeglasses are measured in diopters. The higher the numbers, the stronger the prescription.
Q&A Related to "What Does 20 400 Vision Mean?"
If you have 20 20 vision that means you can see clear from your right and left eye. Most people do not have 20 20 vision and have to wear glasses.
http://answers.ask.com/Health/Other/what_is_20_20_...
On the Snellen scale, 20/400 means the smallest letter a person with 20/400 can see at
http://www.chacha.com/question/what-does-20%26%234...
20/400 in "plain English" means that you see at 20 yards what the average person sees at 400 yards. Vision worse than that is legally blind. (I will assume that is the eye
http://answers.yahoo.com/question/index?qid=201204...
20/20 refers to visual clarity at a distance of twenty feet. If you have 20/20 vision, you can view an object at twenty feet away with the same clarity as a "normal" person
http://www.quora.com/What-is-20-20-vision
Explore this Topic
20/400 vision is considered severe visual impairment just shy of blindness. In the US any vision that is not corrected to better than 20/200 is considered & ...
The normal vision is 20/20. This is enough to read telephone numbers written in a directory book. A 20/400 eyesight means a person must stand 20 feet away to see ...
A 20/20 vision is the visual acuity that is needed to distinguish between two points. In this equation, the numerator denotes the distance in feet between the ...
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