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"Night blindness resulting from vitamin A deficiency is very, very, very, very rare in individuals who live in America," says Dr. Reichel. And even if it does develop, it can frequently be reversed within an hour by injections of vitamin A.
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www.mothernature.com/Library/Bookshelf/Books/10/89.cfm
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But for some people night blindness is more than momentary. "Some people are quicker to adapt to light changes and darkness," Dr. Laties says. "Nearsighted people can at times be slower to ... In fact, large doses of vitamin A given to a person who is vitamin A deficient can bring improvement in night vision within hours,
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www.mothernature.com/Library/Bookshelf/Books/47/99.cfm
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Night blindness, vitamin A deficiency, and isotretinoin psychotoxicity ; F William Danby; Dermatology Online Journal 9 (5): 30 ; ... Isotretinoin can cause nyctalopia (night blindness). ... Night blindness precipitated by isotretinoin in the setting of hypovitaminosis A. Australas J Dermatol. 1999 Nov;40(4):208-10. PubMed;
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dermatology.cdlib.org/95/letters/isotretinoin/danby.htm...
dermatology.cdlib.org/95/letters/isotretinoin/danby.html
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This study was conducted to validate the night vision threshold test (NVTT) as an indicator of night blindness. A total of 1401 pregnant women from the National Maternity Hospital participated in this study. ... Vitamin A [blood]
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www.medscape.com/medline/abstract/15465750
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Night blindness due to vitamin A deficiency is common during pregnancy among women in Nepal. ... The authors assessed the risk of maternal death during and after a pregnancy with night blindness among women participating in a cluster-randomized, ... Vitamin A/beta-carotene supplementation ameliorates this risk to a large extent.
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www.medscape.com/medline/abstract/10997544?queryText=hy...
www.medscape.com/medline/abstract/10997544?queryText=hypoprothrombinemia%20due%20to%20vitamin%20k%20deficiency
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These changes occur very rapidly, but large quantities of vitamin A are needed to bring this about. If there is any marked deficiency of vitamin A, night blindness may occur. This can usually be corrected by administering suitable amounts of vitamin A in the diet.
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www.healthvitaminsguide.com/deficiencies/night-blindnes...
www.healthvitaminsguide.com/deficiencies/night-blindness.htm
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Nyctalopia - Wikipedia, the free encyclopedia
Nyctalopia (from Greek νύκτ-, nykt- "night"; and αλαός, alaos "blindness") is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases...
en.wikipedia.org/wiki/Nyctalopia
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Retinol - Wikipedia, the free encyclopedia
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Retinol , the animal form of vitamin A, is a fat-soluble vitamin important in vision and bone growth. It is also a diterpenoid. Retinol is among the most usable forms of vitamin A, which also include...
en.wikipedia.org/wiki/Retinol
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Early symptoms may include poor vision at night or in dim light (night blindness) and extreme dryness of the eyes (i.e., xerophthalmia), followed by wrinkling, progressive cloudiness, ... In some developing countries, vitamin A deficiency in the diet and associated keratomalacia are a major cause of childhood blindness.
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www.webmd.com/hw/vision/nord762.asp
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