Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How does it help ?

By using concave lens Myopia can be corrected and by using a convex lens hypermetropia can be corrected. A person having the defects of myopia as well as hypermetropia should use spectacles having bifocal lenses in which upper part consists of concave lens and lower part consists of convex lens.


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