A Cataract is a clouding that develops in the crystalline lens of the
eye or in its envelop, varying in degree from slight to complete
opacity and obstructing the passage of light. Early in the delopment
of age related cataract the power of the lens may be increased,
causing near sightedness (myopia), and the gradual yellowing and
opacification of the lens may reduce the perception of blue colors
Cataracts typically progress slowly to cause vision loss and are
potentially blinding if untreated.

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