Noun
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Cataracts are a disease where the crystalline lens of the eye becomes cloudy.
As we age, the elasticity of the crystalline lens is lost, leading to presbyopia (farsightedness).
In cataract surgery, the cloudy crystalline lens is removed and an artificial lens is inserted.
The crystalline lens plays the role of refracting light and focusing it on the retina, much like a camera lens.
Kanji that make up this word
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