Sensitivity

Sight Human senses - sight

Fact file

Eyesight is probably our most important sense.
Eyes pick up light waves - light waves pass through the eyeball, and are focused on the retina at the back of the eye. The retina passes a nerve impulse to the brain. The brain processes these impulses and we 'see' what is in front of us.
Humans cannot see all types of light. The ultraviolet light that is invisible to us can be seen by bees and other animals.
The coloured part of the eye is called the iris - what colour are your eyes?

Activity:

Optical illusions are some of the best tricks you can play on your senses.