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  2. 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 ...

  3. 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 ...

  4. 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.

  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. Adaptation (eye) - Wikipedia

    en.wikipedia.org/wiki/Adaptation_(eye)

    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. [55]

  7. Is difficulty driving at night the same as night blindness? - AOL

    www.aol.com/lifestyle/driving-night-harder...

    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.

  8. Retinol - Wikipedia

    en.wikipedia.org/wiki/Retinol

    Night blindness, the inability to see well in dim light, is associated with a deficiency of vitamin A, a class of compounds that includes retinol and retinal. In the early stages of vitamin A deficiency, the more light-sensitive and abundant rods , which have rhodopsin , have impaired sensitivity, and the cone cells are less affected.

  9. This vitamin deficiency can cause forgetfulness and mimic ...

    www.aol.com/finance/vitamin-deficiency-cause...

    Vitamin B12 deficiency symptoms . Vitamin B12 deficiency has a few hallmark symptoms, according to doctors: Lack of energy. Mental fatigue. Nausea, vomiting, or diarrhea. Lack of appetite. Weight loss

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