The space between the cornea and iris filled with aqueous humor
A water like fluid, produced by the ciliary body, it fills the front of the eye between the lens and cornea and provides the cornea and lens with oxygen and nutrients
the brain is where the electrical signals sent from our eyes are processed into vision. Damage to the brain can lead to vision loss
The choroid is a layer of blood vessels between the retina and sclera; it supplies blood to the retina
This is where the Aqueous Humor is produced
the eye can bring the fine print in a phone book into focus, or focus in on the moon over 1/4 million miles away. The ciliary muscle changes the shape of the lens-(this is called accommodation). It relaxes to flatten the lens for distance
The conjunctiva is a thin, clear membrane covering the front of the eye and inner eyelids. Cells in this lining produce mucous that helps to lubricate the eye. This is the eyes first layer of protection against infection. Inflammation of this membrane is called conjunctivis, or pink eye
The cornea is a clear, dome-shaped surface that covers the front of the eye. It is the first and most powerful lens the the eye's optical system. To keep it transparent the cornea contains no blood vessels. Tears that flow over it and aqueous humor in the chamber behind it keep it nourished.
The eye is like a little video camera measuring about 1 inch or 2.5 cm in diameter. If someone's eyeball is larger than this, they will be nearsighted (myopic); if it is smaller than this, they will be farsighted (hyeropic). Having 2 eyes give us binocular vision - (depth perception)
Eyelashes and Eyebrows
These specialized hairs protect the eyes from particles that may injure them. They form a screen to keep dust and insects out. Anything touching them triggers the eyelids to blink.
Our eyelids protect and lubricate our eyes. Small oil-producing glands line the inner edge of our eyelids. These oils mix with tears when we blink, keeping the eye moist and clean.
The orbit or eye socket is a cone-shaped bony cavity that protects the eye. The socket is padded with soft fatty tissue that allows the eye to move easily.
Lacrimal Gland (Tear Duct)
This gland continually releases tears and other protective fluids onto the surface of the eye. It lubricates and keeps the cornea from becoming dehydrated.
A tiny pump that drains tears and other debris from the eye. The fluids flow down the nasolacrimal duct into the nose where they help keep the nasal linings moist.
This is the colored part of the eye. It is a ring of muscle fibers located behind the cornea and in front of the lens. It contracts and expands, opening and closing the pupil, in response to the brightness of the surrounding light.
Each optic nerve has about 1.2 million nerve fibers. This is the cable connecting the eye to the brain.
Six muscles are in charge of eye movement. Four of these move the eye up, down, left and right. The other two control the twisting motion of the eye when we tilt our head.
The retina is composed of two types of photoreceptor cells. When light falls on one of these cells, it causes a chemical reaction that sends an electrical signal to the brain.
give us our detaild color daytime vision. There are 6 million of them in each human eye. There are three types of cone cells: one sensitive to red light, another to green light, and the third sensitive to blue light
are about 500 more sensitive to light than cone cells; they give us our dim light or night vision; They are also more sensitive to motion than cone cells. There are 120 million rod cells in the human eye. Most rods are located in our peripheral or side vision.