Our senses: sight (What are the parts of the eye and their functions? and How do we see?)

 Dear students,

Let´s review and check the parts of the sight.

We can see the color, movement and the distance of objects with our eyes. We should protect our eyes when necessary.

Parts of the eyes and their functions.

The iris is the coloured part of the eye. It surrounds the pupil. It´s made of very small muscles that open and close the pupil.

The cornea covers and protects the iris and the pupil.

The lens is a transparent, oval-shaped structure that focuses light on to the retina. It´s located behind the pupil and the iris.

The retina is made up of nervous tissue arranged in thin layers of cells that detect light and colours. They send information to the optic nerve.

The optic nerve is connected to the brain. It transmits information from the retina.

How we see

1.   1. Light goes into the eye through the pupil: then it passes through the lens.

2. The lens project an upside-down image onto the retina. This information is sent to the optic nerve.

3. The optic nerve transmits the information to the brain.

Activity:

* Could you name the different parts of the eye and their functions? 

* Would you be able to explain how the eye works?

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