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It's known as vitamin A deficiency. Signs and symptoms include:

  • Nyctalopia (poor adaptation to darkness)
  • Xerophthalmia (pathologic dryness of the conjunctiva and and cornea)
  • Keratomalacia (softening of the cornea)
  • Corneal perforation
  • Blindness (due to a lack of visual pigments)
  • Bitot spots (white plaques of keratinized epithelial cells)
  • Dry skin and hair
  • Follicular hyperkeratosis (due to clogging of hair follicles)
  • Pruritus (skin itching)
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15y ago

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