A rare birth defect where an embryo develops with a single eye-like structure in the middle of the face instead of two separate eyes.
From 'cyclo-' (circle/single) + 'opia' (eye condition), Greek-based medical terminology. First described medically in the 19th century.
Cyclopia is so rare in humans that it makes learning about it shocking, but it actually gives scientists clues about how embryos develop eyes in the first place—what separates one eye field into two is a fascinating developmental mystery.
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