A person is suffering from both myopia and hypermetropia. What kind of lenses can correct this defect? How are these lenses prepared?
Type of lens to correct the defect:
Preparation of lens:
These lenses are prepared by combining both lenses in such a way that the upper part is the concave lens and the lower part is a convex lens.
Hence, a bifocal lens should be used to correct this defect.