A condition where the eyelid opening becomes abnormally narrow or reduced, often present from birth.
From Greek 'blepharon' (eyelid) + 'phimosis' (narrowing). Phimosis originally described narrowing of the foreskin but is now used for any pathological narrowing.
This congenital condition fascinated early geneticists because it often runs in families—studying inherited eyelid shapes helped scientists understand how traits pass through generations before modern genetics existed.
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