With the help of electricity ______ helps to increase the pitch of the sound.

The maps specially prepared for the blind are called__________

An individual with normal vision can read even the smallest letter from a distance of:

We can see objects only if there is:

____________prevents sound impulses from reaching the brain while we are sleeping.

The condition that affects vision.

We have___________sense organs.

Eye - vision;           Ear - ?

Who proposed the stick which helps to move the blind people?

Work of _______ gives the correct and same size of the object.