Defects of Vision and Braille System

Defects of Vision and their Correction

Name one of the common defects of vision and the type of lens used to remove it.

A girl is using speces of f = -50 cm . Name the defect of her vision and calculate power of lens to be used.

Due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens, a certain defect of vision arises. Write the name of this defect. Name the type of lens required by such persons to improve the vision. Explain the structure and function of such a lens.

Explain with the help of labelled ray-diagram, the defect of vision called hypermetropia, and how it is corrected by a lens.

Cataract|OMR|Color Blindness|Power Of Accommodation|Defects Of Vision And Their Correction|Working Of The Human Eye

Working Of The Human Eye|Power Of Accommodation|Defects Of Vision And Their Correction|Cataract|Color Blindness|OMR