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What level of nearsightedness is legally blind?
If you’re legally blind, your vision is 20/200 or less in your better eye or your field of vision is less than 20 degrees. That means if an object is 200 feet away, you have to stand 20 feet from it in order to see it clearly.
What counts as extreme nearsightedness?
What is High Myopia? Doctors generally define high myopia as nearsightedness of -6 diopters or higher, according to the American Association for Pediatric Ophthalmology & Strabismus. The Association also notes that high myopia often occurs in people with very long eyes, and typically appears during early childhood.
What is the highest nearsighted prescription?
Collaboration between Franco-Slovak experts enabled the need evaluation, design, manufacture and fitting of -108 diopter lenses to correct what is probably the world’s highest degree of myopia. This record, set in February 2016, topped the previous achievement of -104 diopters set by the same team in January 2015.
How is someone illegally blind?
There is no such thing as a literal definition of “illegally blind”, since that just means someone with normal visual acuity. Legally blind encompasses those visually-impaired people who do have some remaining sight, but not enough for normal unaided activity.
What does it mean to be legally blind at 20?
During that test, you may be considered legally blind if your peripheral vision is about 20 degrees or less. Legal blindness means that your visual acuity is worse than 20/200 or a visual field that is less than 20 degrees even with the best possible correction.
What does legal blindness mean?
Legal blindness means that your visual acuity is worse than 20/200 or a visual field that is less than 20 degrees even with the best possible correction. So once you visit your optician or optometrist and undergo these tests, you will want to take a look at your eye prescription.
How can you tell if a person is legally blind?
An eye doctor will measure visual acuity and visual field to determine if a person is legally blind. A common test for visual acuity is the Snellen eye chart. Someone who is legally blind would be able to read only the top line of the chart, a capital E while wearing corrective lenses.
What is a blind person’s visual field?
A visual field is the range of sight that we have without moving our eyes, in order to be considered legally blind you must have a visual field of 20 degrees or less. This change in the field of our vision is commonly referred to as tunnel vision.