What is legally blind?
Question:
Answers:
I think if you're driving and you can't read the word "stop" on a stop-sign without glasses, that's probably legally blind.
Legally blind is vision worse than 20/200 that cannot be improved with corrective lenses. People with a visual field of less than 20 degrees diameter (10 degrees radius) are also considered to be legally blind.
The number you were given could be the diopter value of myopia, or nearsightedness. There is often a second value for astigmatism, followed by a number and x, which is the degree of angle of the astigmatism. These are usually given for both the right eye (OD) and left eye (OS).
Just having the one number makes it hard to tell the meaning of the visual measurement.
In any case, vision of any diopter that is correctible with lenses is not considered to be legally blind.
Legally Blind
The definition for most legal purposes in the United State is 20/200 vision with correction in the best eye, or field of vision less than 20 degrees.
From a practical point of view, the visually impaired community talks in terms of "a high partial", "a low partial", and "totally blind." Someone with 20/200 vision can see what the person with 20/20 vision can, only he has to be within roughly 20 feet of the object rather than 200 feet to see it. That person should also be able to use Large Print or magnification to read fairly comfortably. Eyestrain will become an issue, however, in many situations. A high partial may or may not use any sort of mobility aid such as a White Cane, guide dog, or sighted guide unless travel conditions are difficult. For example, at dust or after dark, a white cane may be helpful to find the edge of steps, ramps or the like.
Low Partial folks will have a tough time with most large print and are more likely to use a mobility aid. Depth perception and glare can become major problems in travel for them. Their choice for handling print material will be limited to either audio presentation or braille.
Totally Blind means a virtual lack of any sort of functional vision. Some people with minimal light perception may refer to themselves as totally blind although they can tell when the light is on in a room and startle the sighted partner by turning off the light. Mobility aids are common and the use of either audio or braille is essential.
you can not see at all
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