10 Quick Facts
- The optic nerve controls the eye to move left, right, up, and down
- The very back of the eye is lined with a layer called the retina which acts very much like the film of the camera.
- The retina contains the “visual” cells called “rods” and “cones”.
- The retina is like the film of a camera. It flips the image so you can see properly.
- The cones provide your sharpest vision and let us see color, and the rods give us our limited night vision.
- The retina transforms light from objects into electrical impulses, which are sent down the optic nerve to the brain.
- The white part of your eye is called the sclera. The sclera is made of a tough material that covers most of the eyeball.
- Between the iris and cornea is the anterior chamber.
- The iris is made up of a ring of muscles. When they tighten your pupil gets smaller, this allows the iris to control how much light goes through the pupil.
- The color of your eye is determined by its pigment.
10 Fun Facts
- Your pupil is a hole into your eye.
- The anterior chamber is filled with a special transparent fluid that is a type of sugar to keep your eye healthy.
- The human eyeball is 24.5mm long but a giant squid eye is 40cm in diameter.
- Scorpions can have as many as 12 eyes.
- An ostrich’s eye is bigger that it’s brain.
- The common goldfish is the only animal that can see both infa-red and ultra –violet.
- The pupil of an octopus is rectangular.
- Our eyes are always the same size from birth, but our nose and ears never stop growing.
- Most people blink about 17,000 times a day.
- The human eye blinks about 4,200,000 times a year.
The function of the eye is to allow a person to visually experience everything around them. The different parts of the eye are the pupil, iris, cornea, sclera, retina, anterior chamber, crystalline lens, optic nerve, and the episclera.
The pupil is the black part of your eye that you see out of. It is a hole in your eye. It takes light in and sends it to the crystalline lens, which takes the light in and reflects light out.
The iris is the color in your eye, which is determined by the pigment, and it determines whether you have more or less pigment. If you had no pigment, your eye would be pink. To have green, hazel, brown, or honey colored eyes you would have more pigment. Your iris changes color depending on what you wear or what mood your feeling.
The cornea protects your pupil with a clear covering. If you scratch your eye, you have scratched you’re the cornea. When you scratch your cornea you are at risk of getting an eye infection.
The sclera is mostly known as the “white part” of your eye. It is the tough tissue that serves as the eye's protective outer coat. Six tiny muscles connect to it around the eye and control the eye's movements. The optic nerve is attached to the sclera at the very back of the eye. In children, the sclera is thinner allowing the underlying tissue to show through and giving it a bluish cast.
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 rods and cones. There are more rods and cones in the middle area of the retina than anywhere else in the eye. Nerves attached to the rods and cones join to form the optic nerve.
The anterior chamber is the space in the eye that is behind the cornea and in front of the iris. The front section of the eye's interior where aqueous humor flows in and out of providing nourishment to the eye and surrounding tissues.
Crystalline lens is behind the pupil; it bends the light so that it hits the retina in the back of your eye. When the eye wants to see farther or closer the lens can get thicker or thinner, which helps you focus.
The optic nerve is behind the eye and leads to the brain, and consists mainly of fibers derived from the ganglionic cells of the retina.
The episclera a thin layer of tissue containing many blood vessels that nourish the sclera. At the front of the eye, the episclera is covered by the conjunctiva.