In old age eyesight becomes foggy when it happens person is said to have __________

Sensations felt by the nerve cells are transmitted to the brain through the _______

_________ controls the amount of light entering into the eye

Braille system has ____ dots patterns and characters

Splitting of light into its colours is known as ________ of light

__________ are used in submarines, tanks and also by soldiers in bunkers to see things outside

The comfortable distance at which a person can read is about ______

Lack of __________ in foodstuff is responsible for many eye troubles

An image formed by a mirror the left of the object appears on the right and the right appears on the left this is known as _________