What is the middle of the eyeball made of?
The central core of the eyeball is a gel-filled area called the vitreous. Behind the vitreous, at the back of the eye is the retina. The retina is composed of 10 fine layers of specialized nervous tissues that respond to light exposure by initiating chemical reactions that are translated into electrical signals which are then transmitted to the back of the brain through a large nerve in the back of the eye (optic nerve). What muscles move the eyeballs? Six different muscles located around the eyeball are capable of directing the eyes toward the subject to be seen. What are tears? The eyes are protected by the tears normally produced by the tear glands (lacrimal glands) located above the outer portion of each eye. The tears drain from the eyes through the tear ducts, located on the inner portion of the eyes. These ducts drain into the nose. This is why our noses run when we weep! For more in-depth information about eye care, please read the MedicineNet.com Eye Care article.
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