Answer:
Letter D is correct!
Explanation:
Cataract is a disease characterized when the lens loses transparency and thereby compromises the focus of vision, which is impaired by seeing near and far, which causes blurred vision. It is a disease that mainly affects the elderly, because the lens fibers become thicker making the natural lens of the eyes less elastic and opaque. Cataracts progresses rapidly, making vision blurred, and if left untreated can lead to blindness.