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https://en.wikipedia.org/wiki/Vitamin_A_deficiency

First paragraph of the article: "Vitamin A deficiency (VAD) or hypovitaminosis A is a lack of vitamin A in blood and tissues. It is common in poorer countries but rarely seen in more developed countries. Nyctalopia (night blindness) is one of the first signs of VAD. Xerophthalmia, keratomalacia, and complete blindness can also occur since Vitamin A has a major role in phototransduction." -Copied from Vitamin A deficiency

Reasons to make contribution, and solution: -The beginning could use some more background information != "There are essentially 3 forms of vitamin A, which include: retinols, beta carotenesand carotenoids. " Causes section: "The major cause is roughage which include few animal sources of pre-formed vitamin A.[citation needed] In addition to dietary problems, there are other causes of VAD. Iron deficiency can affect vitamin A uptake. Excess alcohol consumption can deplete vitamin A, and a stressed liver may be more susceptible to vitamin A toxicity. People who consume large amounts of alcohol should seek medical advice before taking vitamin A supplements. In general, people should also seek medical advice before taking vitamin A supplements if they have any condition associated with fat malabsorption such as pancreatitis, cystic fibrosis, tropical sprue and biliary obstruction. Other causes of Vitamin A deficiency are inadequate intake, fat malabsorption, or liver disorders. Deficiency impairs immunity and hematopoiesis and causes rashes and typical ocular effects (e.g., xerophthalmia, night blindness).[17]" -Copied from Vitamin A deficiency
 * There are essentially 3 forms of vitamin A: retinols, beta carotenes, and carotenoids.

Reasons to make contribution, and solution: -There is more than 3 causes, even though this is an extensive explanation of the 3 causes, there is still a bit more that should be added at the end, since most of the paragraph was used to express how people who drink a lot of alcohol, inadequately eating enough foods that have vitamin A, the malabsorption of fat and night blindness. !=other causes include: fibrosis, pancreatic insufficiency, IBD, and in people who have undergone small-bowel bypass surgery.
 * Need to mention the increased risk for people such as: vegans, refugees, and recent immigrants. These other causes include: fibrosis, sprue, pancreatic insufficiency, IBD, or cholestasis, as well as in persons who have undergone small-bowel bypass surgery.