A medical condition characterized by opacity or cloudiness of the lens or cornea of the eye, causing blurred or milky vision.
From Greek glaukos 'greyish-blue' or 'cloudy' + -osis (suffix denoting a pathological condition). The term refers to the grey or blue-grey appearance of affected eyes.
The ancient name for cataracts came from how cloudy eyes look grey-blue—doctors literally named the disease after its appearance before they understood the actual biology underneath.
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