An eye defect in which the lens becomes opaque due to several reasons and the person cannot see the objects clearly as the light rays do not pass through it is
Glaucoma
Cataract
Astigmatism
Myopia
As we have discussed in disorders of eye -
Cataract is the type of eye defect the lens becomes opaque due to several reasons. The person cannot see the objects clearly as the light rays do not pass through it. Surgical removal of the lens and its replacement by a convex lens is the only remedy for this disease.
Hence, Cataract is the correct option.