Cataract
An eye condition in which the lens becomes clouded so that light no longer passes through clearly, blurring vision; aging is its most common cause.
Claude Monet's 1923 cataract surgery removed his right eye's lens, giving him a rare ability: seeing ultraviolet light, which healthy lenses filter out. Water lily flowers glow in UV. His late paintings show it — strikingly more blue and violet than anything before the surgery.
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