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Visual impairment may cause people difficulties with normal daily activities such as driving, reading, socializing, and walking. Cataracts are the most common cause of blindness. Screening for vision problems in children may improve future vision and educational achievement. Screening adults without symptoms is of uncertain benefit. As of 2015 there were 940 million people with some degree of vision loss. 246 million had low vision and 39 million were blind. Rates of visual impairment have decreased since the 1990s.
Visual impairments have considerable economic costs both directly due to the cost of treatment and indirectly due to decreased ability to work. The World Health Organization uses the following classifications of visual impairment. This definition was set in 1972, and there is ongoing discussion as to whether it should be altered to officially include uncorrected refractive errors. 60 with normal fields of vision, or gross visual field restriction. Unable to see at 3 metres what the normally sighted person sees at 60 m. Not eligible to drive and may have difficulty recognising faces across a street, watching television, or choosing clean, unstained, co-ordinated clothing. The accompanying guidance for clinical staff states: “The National Assistance Act 1948 states that a person can be certified as severely sight impaired if they are “so blind as to be unable to perform any work for which eye sight is essential”.
The test is whether a person cannot do any work for which eyesight is essential, not just his or her normal job or one particular job. The Department of Health also state that a person is more likely to be classified as severely visually impaired if their eyesight has failed recently or if they are an older individual, both groups being perceived as less able to adapt to their vision loss. Low vision applies to all individuals with sight who are unable to read the newspaper at a normal viewing distance, even with the aid of eyeglasses or contact lenses. 20 degrees in the better eye. Braille or other non-visual media.