The Eye -by Ted, Jill, Robson, Matthew, Collette

Quick facts (10 things everyone should know):

· There are nine parts of the eye, and it is an organ of sight
· The optic nerve controls left, right, up, down
· The color in your eye is determined by its pigment
· Light waves (after going through the cornea) will go through the crystalline
lens
· The iris controls how much light is allowed to enter the pupil
· The lens bends the light so that it shines on a certain part of the eye called
the retina
· The retina is like a film in a camera; it flips the image so you can see
properly
· There are six muscles that are used to rotate the eye
· Some people’s eye color changes by what they are wearing (that is called a
pigment dispersion)
· When the eye wants to see far or close the lens gets thinner or thicker


Fun facts (5-10 cool, gross or unbelievable things you found out):

· Most people would agree that the sight is the sense that they would value more
than the rest
· The pupil is a hole
· The vitreous humor is 99% water and also has sugar, inorganic salt, and acid
· When you get dry eye, it is when the first layer of the cornea gets scratched
· The cornea is transparent
· The macula is the red bulgy stuff that is in the corner of your eye
· Kim Goodman of Chicago, Illinois, U.S.A. popped her eyes 11mm out of her
sockets (she hold the world record)

 

The different parts of the eye are the: cornea; extra ocular muscles; crystalline lens; iris;
conjunctiva; optic nerve; macula; vitreous humor; and retina. (Vitreous is a scientific name for your eye.)

The cornea protects and is a clear covering over the pupil and the eye, and has 5 layers. They are called epithelium, Bowman membrane, stoma, Decrement’s membrane, and endothelium. If you scratch your eye, you have scratched the cornea. When you
scratch your cornea you are at risk of getting an eye infection. The outside layer of the cornea is also called the tubic fibrosa.

The crystalline lens is behind the pupil; it bends the light so that it hits the retina in
the back of the eye. There are 4 layers, capsule, sub capsular epithelium, cortex, and nucleus. When the eye wants to see far or close the lens can get thicker or thinner, which helps you focus.

The pupil is the black part of your eye that you see out of. It is a hole in
your eye. It also takes light in and sends it to the crystalline lens, which
takes the light in and reflects light out.


The iris has 1 layer and it is called the endothelium. The iris is the color in your
eye determined by the pigment, and it determines whether you have more or less
pigment. If you have blue eyes, you have less pigment. If you have no pigment,
your eye would be pink. To have green, hazel, brown, or yellow eyes you would
have more pigment. Your iris changes color on what you are wearing or what mood
you are in. If you put 2 of the same objects up against each side of your eye,
your eye color can take on the color of the objects (pigment dispersion). The vitreous humor is
inside of the iris, it is what holds the pigment in place. We inherit this colour from our parents, the most common colour is brown. If one parent has brown eyes, and the other parent blue eyes, the child will usually have brown eyes.

When it is sunny or a bright day, our eyes do not need to let in much light, and our pupils are small. But when there is less light, like at nighttime, the pupils have to open more and they get bigger. Small muscles change the size of the iris around the pupil.

The retina is the inside layer of the eye, it forms the
image so you can see. The retina is like the film in a camera, so an image can
be formed when hit by light. The retina has 2 kinds of light sensitive cells called rods and cones, they take in light waves and change them to electrical signals. There are more rods and cones in the middle area of the retina. Nerves attached to cones and rods join to form the optic nerve. If you have more cones you are near sighted (myopia), more rods will make you far sighted (hyperopia), and if you have about 120 million rods and about 6 million cones you will have perfect sight.

The optic nerve is behind the eye and leads to the brain, it is behind the eye and is a nerve that leads to the brain. It takes information from the brain and sends it to the eye, and from the eye back to the brain. The optic nerve controls movement.

The other systems that the eye interacts with are the: brain; heart; blood; and
blood veins. The eye also has 6 muscles used to rotate it.

Light waves from objects enter your eye through the clear cornea and then through the pupil,
after that it travels through the pupil, which is the circular aperture in the iris.

The eye helps you to see, and gives you balance. Your eyesight reacts more quickly than your
sense of smell. For example, if a house was on fire you would see the fire before you could
smell it; and then it might be too late. It also helps you perform activities.
For example, without your eyes you would have to read brail, and without your
eyes you would not have hand-eye coordination.
We inherit this colour from our parents, the most common colour is brown. If one parent has brown eyes, and the other parent blue eyes, the child will usually have brown eyes.

When it is sunny or a bright day, our eyes do not need to let in much light, and our pupils are small. But when there is less light, like at nighttime, the pupils have to open more and they get bigger. Small muscles change the size of the iris around the pupil.