​Different people have different eyes. What are the usage of eyes?

​What are the differece between these animal eyes?

​Eyes are actually spherical(ball-shaped).

​This is a eye model.

​This is an eyeball found on Florida beach.
It could be a whale's eyeball.

A Giant Squid eye. It has the largest known eye in the entire animal kingdom.

​A star-nosed mole has very small eyes.
They are almost blind.

IRIS

THE COLOURED PART OF OUR EYES

PUPIL

The black hole where light enters the eye. The pupil gets big when it is dark and small when the light is bright.

1. ​Light enters the cornea

2. then the light goes through the pupil

3. the iris makes the pupil bigger to let more light in or smaller to let less light in.

4. light goes through the lens and focuses it on the retina.

5. The retina sends message to the brain through the optic nerve.

LENS, RETINA AND OPTIC NERVE

The light goes through the lens and make an image at the back of the retina. The image is upside down!!

The optic nerve transports the image to the brain and the brain flips the image.

​Optical Illusions:
Images that trick the brain

​Which line is the longest?

​They are all the same length!

​What do you see?

​What do you see?

​Mantis Shrimp have the most complex eyes in nature.

They can see things we would find invisible.

They can see from the infrared to the ultraviolet.