Human eye

Human eye

We see with our eyes. Our eyes tell us about colors, shapes and movement of objects around us. The eye is an organ of sight.

The human eye consists of an eyeball. The eye is covered with eyelids. Eyelashes on the eyelids keep away dust particles. Under the upper eyelids tear glands open.

Main parts of eye are cornea, iris, pupil, lens, retina and optic nerve.

Cornea

In the front of eye, the transparent part is called cornea. Light rays enter the eye through the cornea.

Iris

Beneath the cornea the colored portion of the eye is called iris. Have you ever observed brown, blue and hazel eyes of your friends?

There is a hole in the middle of the iris, known as pupil. This pupil contracts in bright daylight and expands in dim light.

Lens

Behind the pupil, a fixable lens is present. The lens helps the eye to focus light.

Retina

The light sensitive portion of the eyeball is called retina. Eye lens forms the image on the retina.