This category encompasses a wide variety of corneal disorders, some of which, such as keratoconjunctivitis sicca, occur very frequently. Causes include:
❖ Inflammations (blepharitis and conjunctivitis).
❖ Injuries (rubbing the eyes, foreign bodies beneath the upper eyelid, contact lens incompatibility, exposure to intense ultraviolet irradiation).
❖ Age-related changes (senile ectropion with trichiasis; spastic entropion; keratoconjunctivitis sicca).
❖ Endogenous factors (facial neuropathy).
❖ Exogenous factors (medications or preservatives).
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