In human eye, image is formed

Inability of eye to see objects clearly is called

Variation of focal length to form a sharp image on retina is called

Light enters eye through a transparent membrane known as

The persistence of vision for human eye is

Runny nose and crying may be outcomes of

Condition in which image is formed in front of retina is called

Internal reflection of light is prevented through the

Twinkling of stars is due to atmospheric

Function of eyelids includes