A cataract is a clouding that develops in the crystalline lens of the eye, varying in degree from slight to complete opacity and obstructing the passage of light. The gradual yellowing and opacification of the lens may reduce the perception of colors. Cataracts typically progress slowly to cause vision loss, and are potentially blinding if untreated. The condition usually affects both eyes, but almost always one eye is affected earlier than the other.
A cataract is a clouding that develops in the crystalline lens of the eye, varying in degree from slight to complete opacity and obstructing the passage of light. The gradual yellowing and opacification of the lens may reduce the perception of colors. Cataracts typically progress slowly to cause vision loss, and are potentially blinding if untreated. The condition usually affects both eyes, but almost always one eye is affected earlier than the other.