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  Close your eyes.

  What do you see?

                           www.graphicleftovers.com

  If your answer is nothing, you are right!

  Ever wonder why you can't see in the dark?

  That's because your eyes need light to see.

  Light waves are seen 

  like colors 

  of the rainbow

 On a bright sunny day, 

 cells in your eyes called cones,               www.clipartpanda.com

 pick up the reflection of the sun 

 and help us see in bright light.

                                     www.clipartpanda.com

Light comes into your eyes

through the cornea (say: KOR-nee-uh),

which protects your eye. It sits

in front of the colored part of

your eye. But you can't see it 

because it's clear like glass.

Light then passes through your pupil 

(say: PYOO-pul), the black dot in your eye              www.123tagged.com

that looks like this:

                                             www.123tagged.com

The size of your pupil changes depending if you're in the dark    

or in the light. It controls how much light it wants to allow to 

come through in order to see. The darker it is, the bigger 

your pupil gets. The brighter it is, the smaller your pupil gets. 

It    looks like this:

                              Try and see for yourself! Have

                                  your parents help you shine a light

                                  near your eye and you will be able

                                  to see your pupils change sizes.                     

        www.123tagged.com

The colored part that surrounds 

your pupil is called the iris

(say: EYE-riss). It's what controls 

your pupil to change its sizes by 

using its muscles to squeeze it. Iris's 

come in all kinds of colors. 

What color is yours?                            www.etsy.com

Now these next few parts of your 

eye are really cool! You and I actually 

can't see them, only doctors can through 

their microscopes. 

After light passes through your pupils, 

it goes through your lens. The lens is 

found right behind the iris and has no 

color. The lens's job is to focus incoming 

light on the back of the eyeball called 

the retina (say: RET-in-uh).

                                                            www.geteyesmart.com

Your retina is located in the very back of your eye. Inside it carries 

millions and millions of cells that are sensitive to light. It takes the light it 

sees, changes it to nerve signals, and your brain understands why it's seeing.

The retina also uses cells called rods and cones to process the light 

we see. There's about 120 million rods in each eye and about 5 

million cones. They process light to give you the whole picture.

The rods help us see in the dark. This is because rods see in black, 

white and all shades of gray. They can't tell the difference between 

colors.

The cones help us see in bright light. This is because they sense 

colors and they need more light then rods do in order to work. There 

are 3 different cone types. Each type is sensitive to one specific 

color-red, blue or green. This is what helps us see millions of colors.

Now this next function of your eye is what's connected to your 

brain. The rods and cones of the retina change the colors and 

shapes we see into millions of nerve messages. The optic nerve 

then carries those messages from your eye to your brain. The 

combination and gathering of all these cells form together like 

strands of a rope and that's what forms the optic nerve.

                                        www.webmd.com

Have you ever heard of an optical illusion? You won't believe 

your eyes! But in this case, you actually do. But, you're eyes 

are playing tricks on you. You see, that's what an optical 

illusion is. Seeing something that doesn't really exist, or isn't 

how it appears. Here's what a few look like.

        www.boredpanda.com

Doesn't this look like an eye to 

you? It's not though! It's actually 

a sink filled with soap and water 

and as it's going down the drain it's 

transforming to look like it's an 

eye!

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