Distance vision impairment: Mild – Visual acuity is worse than 6/12 to 6/18. Moderate – Visual acuity is worse than 6/18 to 6/60. Severe – Visual acuity is worse than 6/60 to 3/60. Blind – worse than 3/60 eyesight. 14окт. 2021 Blindness is a lack of vision. It may also refer to vision loss that cannot be corrected with eyeglasses or contact lenses. Partial blindness means that your eyesight is very limited. Complete blindness means that you cannot see anything and you cannot see the light. The main causes of visual impairment and blindness are uncorrected refractive error and cataracts. The majority of people with visual impairment and blindness are over 50 years old. However, loss of vision can affect people of all ages. Low Vision – This refers to severe visual impairment with a visual acuity of 20/70 or less. This cannot be improved with glasses or contact lenses. Legally Blind-This means that a person has 20/200 corrected vision with the best visible eyes. Completely blind-this means complete loss of vision.
Blindness is defined by the World Health Organization as the best correction of less than 20/500 or the best eye vision of a person with a visual field of less than 20/500. Less than 10 degrees. This definition was set in 1972 and there is ongoing debate as to whether it should be changed to officially include uncorrected refractive error.
How do you define blindness?
There are several ways to define blindness. Many people consider visual impairment to be invisible at all, or at best, indistinguishable from darkness. The National Federation of Blinds has a much broader view.
What are the main causes of visual impairment and blindness?
The main causes of visual impairment and blindness are uncorrected refractive error and cataracts. The majority of people with visual impairment and blindness are over 50 years old.
How many people in the world are visually impaired or visually impaired?
Worldwide, at least 2.2 billion people have vision impairment or blindness, of which at least 1 billion have vision impairment that has been prevented or has not yet been addressed.
What is the difference between legally blind and completely blind?
Legally blind means that the good eye vision after the best correction (contact lenses or spectacles) is less than 20/200, or the good eye field of view is less than 20 degrees. increase. Completely blind students learn through Braille or other non-visual media.
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