enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Hypervitaminosis A - Wikipedia

    en.wikipedia.org/wiki/Hypervitaminosis_A

    Vitamin A toxicity is known to be an ancient phenomenon; fossilized skeletal remains of early humans suggest bone abnormalities may have been caused by hypervitaminosis A, [21] as observed in a fossilised leg bone of an individual of Homo erectus, which bears abnormalities similar to those observed in people suffering from an overdose of ...

  3. Vitamin A deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_A_Deficiency

    Vitamin A plays a major role in phototransduction, so this deficiency impairs vision, often presenting with nyctalopia (night blindness). [1] In more severe VAD cases, it can progress to xerophthalmia, keratomalacia, and complete blindness. [1] Vitamin A deficiency is the leading cause of preventable childhood blindness worldwide and is a major ...

  4. Vitamin A - Wikipedia

    en.wikipedia.org/wiki/Vitamin_A

    An early sign of vitamin A deficiency is night blindness. [6] Vitamin A in the form of retinoic acid is essential to normal epithelial cell functions. Severe vitamin A deficiency, common in infants and young children in southeast Asia causes xerophthalmia characterized by dryness of the conjunctival epithelium and cornea. Untreated ...

  5. Xerophthalmia - Wikipedia

    en.wikipedia.org/wiki/Xerophthalmia

    It may be caused by vitamin A deficiency, [1] which is sometimes used to describe that condition, although there may be other causes. Xerophthalmia caused by a severe vitamin A deficiency is described by pathologic dryness of the conjunctiva and cornea. The conjunctiva becomes dry, thick and wrinkled. The first symptom is poor vision at night.

  6. Nyctalopia - Wikipedia

    en.wikipedia.org/wiki/Nyctalopia

    Night blindness may exist from birth, or be caused by injury or malnutrition (for example, vitamin A deficiency). It can be described as insufficient adaptation to darkness. The most common cause of nyctalopia is retinitis pigmentosa , a disorder in which the rod cells in the retina gradually lose their ability to respond to the light.

  7. Here’s When You Do—and Don’t—Need Vitamins - AOL

    www.aol.com/lifestyle/don-t-vitamins-140000917.html

    Lighter Side. Medicare. News

  8. Hypervitaminosis - Wikipedia

    en.wikipedia.org/wiki/Hypervitaminosis

    Hypervitaminosis is a condition of abnormally high storage levels of vitamins, which can lead to various symptoms as over excitement, irritability, or even toxicity. Specific medical names of the different conditions are derived from the given vitamin involved: an excess of vitamin A , for example, is called hypervitaminosis A .

  9. Toxic and nutritional optic neuropathy - Wikipedia

    en.wikipedia.org/wiki/Toxic_and_nutritional...

    The predominant cause of nutritional optic neuropathy is thought to be deficiency of B-complex vitamins, particularly thiamine [2] (vitamin B 1), cyanocobalamin (vitamin B 12) and recently copper. [3] Deficiency of pyridoxine (vitamin B 6), niacin (vitamin B 3), riboflavin (vitamin B 2), and/or folic acid also seems to play a role. Those ...