What is the first sign of vitamin A deficiency?

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  1. #produce
  2. #corneas
  3. #deficiency
  4. #tears
  5. #blindness
  6. #first
  7. #inability
  8. #summary
  9. #dying
  10. #bitot
  11. #vitamin
  12. #spots
  13. #signs
  14. #often
  15. #known