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Cataract

(Science: ophthalmology) An ocular opacity, partial or complete, of one or both eyes, on or in the lens or capsule, especially an opacity impairing vision or causing blindness.

The many kinds of cataract are classified by their morphology (size, shape, location) or aetiology (cause and time of occurrence).

Origin: L. Cataracta, from gr. Katarraktes = waterfall, floodgate, portcullis