A medical condition where an extra row of eyelashes grows behind the normal row, often causing eye irritation.
From distichal (two rows) + -iasis (medical condition suffix). Medical Greek created this term to describe the doubling of eyelash rows, which shouldn't happen in healthy eyes.
Some people are born with this condition, and surprisingly, some dogs (especially breeds like spaniels) commonly have distichiasis—it shows how evolution can create genetic variations that are usually harmless.
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