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Nyctalopia (/ ˌ n ɪ k t ə ˈ l oʊ p i ə /; from Ancient Greek νύκτ-(núkt-) 'night' ἀλαός (alaós) 'blind, invisible' and ὄψ (óps) 'eye'), [1] also called night-blindness, is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases.
Night blindness can be caused by a number of factors the most common of which being vitamin A deficiency. If detected early enough nyctalopia can be reversed and visual function can be regained; however; prolonged vitamin A deficiency can lead to permanent visual loss if left untreated.
Looking west across West 20th St at Heiskell Library for the Blind on a cloudy morning. The Andrew Heiskell Braille and Talking Book Library, also known as the Heiskell Library and formerly as the Andrew Heiskell Library for the Blind and Physically Handicapped and the New York Free Circulating Library for the Blind is a branch of New York Public Library (NYPL) on West 20th Street in the ...
Night blindness, on the other hand, which is also referred to as nyctalopia, is a condition in which someone has extreme difficulty or loses the ability to see in the dark or in dimly lit areas.
Lighthouse Guild is an American charitable organization, based in New York City, devoted to vision rehabilitation and advocacy for the blind. Its mission statement is "To overcome vision impairment for people of all ages through worldwide leadership in rehabilitation services, education, research, prevention and advocacy."
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Diabetic retinopathy is a leading cause of blindness. Helen Keller International helps prepare health care systems to identify and treat diabetic retinopathy. In collaboration with Chittagong Eye Infirmary and Training Complex and the Diabetes Association of Bangladesh, Helen Keller began a pilot project in 2009 to improve patients' access to sight-saving diabetic retinopathy treatment ...
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