A rare medical condition in which the eyes are hidden or concealed, either covered by skin or failing to develop properly, leaving the person blind.
From Greek 'kryptos' (hidden) + 'ophthalmos' (eye), a clinical term describing a congenital condition where the eyelids fail to separate or the eyes fail to form.
Cryptophthalmos shows how the Greek prefix 'crypto-' entered medical terminology not just for things that are small or invisible, but for actual medical absence—someone with this condition is literally born without visible eyes.
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