Human senses - sight
- 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?
Optical illusions are some of the best tricks you can play on your senses.
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