If your prescription is -2.5 or lower, this means that you are legally blind as visual acuity of -2.5 is equivalent to 20/200 vision. According to the National Eye Institute, the U.S. Once you’ve taken these tests, you will want to take a look at your eye prescription. Legally blind is used by the government to describe a person with vision below a certain measurement. During this test, you may be considered legally blind if your peripheral vision is about 20° or less. Your optician may also give you a visual field test in order to test your field of vision. By contrast, a person with normal vision (20/20) can see said object clearly from 200 feet away. In the US, the criteria for legal blindness are: Visual acuity of 20/200 or worse in the better eye with corrective lenses (20/200 means that a person at 20 feet from an eye chart can see what a person with normal vision can see at 200 feet) Visual field restriction to 20 degrees diameter or less (tunnel vision) in the better eye. This means that if there is an object located approximately 200 feet away, you need to stand 20 feet away from it in order to see clearly. When completing this test, you are considered legally blind if your vision is deemed to be ‘20/200’ or less. You may also hear the broader terms impaired vision and vision loss. Legally blind is different from low vision, which is vision that is 20/70 or worse with correction.
A person with normal vision, on the other hand, can stand 200 feet away and perfectly see that object.
That is, if an object is 200 feet away, you must stand 20 feet away to see it clearly. To test your vision, your optician will make you look at a Snellen chart – the familiar chart of mixed letters that you read from a distance of about 20 feet. The definition of legally blind is fairly straightforward: A person is legally blind if their vision is 20/200 or worse even with glasses or other vision correction. At what vision is legally blind Your vision in your better eye is 20/200 or less, or your field of vision is less than 20 degrees if you’re legally blind. To put it simply, legal blindness is measured by looking at your central visual acuity (essentially how well you see what is in front of you) and your field of vision (how well you can see to the sides, above, and below you). Before talking about which prescription is legally blind, it’s important to explore what legal blindness actually is.
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