The separation or dilation of the pupil of the eye beyond its normal size.
From Greek koro- (pupil) and diastasis (separation, standing apart), describing an ophthalmological condition where the pupil becomes abnormally wide or separated.
The pupil's amazing ability to shrink and expand is controlled by tiny muscles, and corodiastasis describes what happens when that control goes wrong—it's literally pupils standing too far apart or dilated.
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