Definitions

  • Keratoconjunctivitis sicca (KCS): eye with some degree of dryness.

  • Xerophthalmia: dry eye associated with vitamin A deficiency.

  • Xerosis: extreme dryness with keratinization occurring secondary to severe conjunctival cicatrization.

  • Sjögren syndrome: autoimmune inflammatory disease of which KCS is a typical feature (see below).

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