This clip is a look at the human eye and how it works. We illustrate the functions of the eye with models, film clips and magnified images. The eye is a ball with a hole at the front, the pupil, which lets in light. Inside the eye is a lens which focuses the light onto a surface at the back of the eyeball. This surface is called the retina and is made up of special cells which detect light and send messages to our brain, allowing us to see. When we have our eyes tested, an optician shines a light into our eye and uses a magnifying lens. This shows the optician the blood vessels on the surface of the retina and the light-sensitive cells. A human eye has more than a million light-sensitive cells.

This clip is from:
Science Clips, How We See Things
First broadcast:
12 October 2007

This clip provides a good introduction to help children gain a knowledge and understanding of the components of the human eye and how it works. Prior to watching the clip, ask each child to draw their own diagram of a human eye, as how they imagine it to be. After playing the clip, the children can each be provided with a worksheet containing an actual, blown-up diagram of the human eye and words such as pupil, retina, lens, eyeball, blood vessel and so on, scattered around it. They can then be asked to join the word to the correct part of the eye using pens, pencils and rulers.