Editing Retinol (section)

===Deficiency===
{{main|Vitamin A deficiency}}
[[Image:Vitamin A deficiency.PNG|right|thumb|360px|Prevalence of vitamin A deficiency in 1995]]
Vitamin A deficiency is common in developing countries but rarely seen in developed countries. Approximately 250,000 to 500,000 malnourished children in the developing world go blind each year from a deficiency of vitamin A.<ref>{{cite web |url=https://www.who.int/nutrition/topics/vad/en/ |title=Micronutrient deficiencies - Vitamin A deficiency |author=<!--Not stated--> |date=18 April 2018 |website=World Health Organization |access-date=18 April 2018 }}</ref> Vitamin A deficiency in expecting mothers increases the mortality rate of children shortly after childbirth.<ref>{{cite journal | vauthors = Akhtar S, Ahmed A, Randhawa MA, Atukorala S, Arlappa N, Ismail T, Ali Z | title = Prevalence of vitamin A deficiency in South Asia: causes, outcomes, and possible remedies | journal = Journal of Health, Population, and Nutrition | volume = 31 | issue = 4 | pages = 413–423 | date = December 2013 | pmid = 24592582 | pmc = 3905635 | doi = 10.3329/jhpn.v31i4.19975 }}</ref> [[Night blindness]] is one of the first signs of vitamin A deficiency. Vitamin A deficiency contributes to blindness by depleting the necessary form needed for rhodopsin.<ref name=bs/>