Involuntary, rhythmic twitching or spasmodic contractions of the eyelid muscles, often occurring repeatedly.
From Greek 'blepharon' (eyelid) + 'klonos' (tumultuous motion or spasm). The 'klonos' root refers to the jerky, repetitive nature of involuntary muscle contractions and has been used in neurology since the 19th century.
Most people experience occasional eyelid twitches from stress or caffeine, but persistent blepharoclonus can actually be a sign of serious neurological conditions like epilepsy or basal ganglia disorders, which is why a twitchy eyelid that won't go away deserves a doctor's attention.
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