The human eye is the most important sense organ. It helps us see the colourful world.

The eye works mainly with light and its structure is similar to a camera.

The eyeball is spherical and about 2.3 cm in diameter.

Light enters through the cornea, which causes maximum refraction.

The iris controls the size of the pupil. The pupil acts as a variable aperture.

The eye lens forms a real and inverted image on the retina.

The retina is a light-sensitive screen with rods and cones.

Electrical signals travel through the optic nerve to the brain.

The ability to adjust focal length is called accommodation.

Near point = 25 cm, Far point = Infinity.

In old age, the lens may become cloudy – this is called cataract.