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xerophthalmia

n. excessive dryness of the eyes, due to histological changes in the cornea and conjunctiva. Xerophthalmia is a characteristic symptom of Sjögren’s syndrome, a systemic autoimmune disease with an onset between 40 and 65 years. Xerophthalmia is also one of the ocular effects of vitamin A deficiency.

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Psychology term of the day

January 13th 2025

fossil

fossil

n. the remains or traces of an organism that lived in the past, often the remote past. Usually only the hard parts of organisms become fossilized (e.g., bones, shells, wood), but under certain circumstances, an entire organism is preserved. In some cases, the organism has been turned into stone, a process called petrification.