How do you see?

Sight maybe you are most important sense for finding out about the world around you. Your eyes work with your brain to help you see.

When you look at something, light bounces off it and enters your eye. The light travels to the back of your eye, to a nerve called the optic nerve. The optic nerve carries messages about the light to your brain. When your brain gets the messages, you know what you are seeing.

The coloured circle on your eyeball is your iris. In the centre of your iris is a dark spot. That is your pupil. Your pupil is a hole that lets light into your eye. Muscles in your iris make your pupil bigger or smaller to let in more or less light. The darker it is around you, the larger your pupil gets. The brighter it is around you, the smaller your pupil gets.

Tears come from little holes behind your eyelids. They bathe the outside of your eyeballs. They clear your eyes of dust and hairs. They also keep your eyes wet.

You can watch your pupils get bigger and smaller. It’s easy. All you need is a lamp and a hand-held mirror. Stand in a part of the room away from the lamp. How big are they? Now stand close to the lamp. Look at your pupils again. How did they change? Did they get smaller? What do you think would happen if you moved away from the lamp again? Try it.

Picture Credit : Google

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