Eye

===The eye is an organ which allows humans to see. It consist of the Cornea, Aqueous Humor, Pupil, Iris, Ligaments, Muscle, Vitreous Humor, Retina, Blood vessels, Choroid, Sclera, Fovea, and the Optic nerve. The Cornea is a transparent layer forming the front of the eye. Aqueous Humor is a clear fluid filling the space in front of the eyeball between the lens and the cornea. The Pupil is a dark circular opening in the center of the iris of the eye. It varies in size in order to regulate the amount of light reaching the retina. Iris is a flat, colored, ring shaped membrane behind the cornea of the eye. It has an adjustable circular opening in the center. Ligaments are short bands of though flexible fibrous connective tissue that connects two bones or cartilages, it holds a joint together. The Muscle is a band or bundle of fibrous tissue in human or animal bodies. It has the ability to contract, thus producing movement in or maintaining the position of parts of the body. Vitreous humor is a transparent jelly-like tissue filling the eyeball behind the lens. Retina is a layer in the back of the eyeball containing cells that are sensitive to the light and trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed. Blood vessels are tubular structures that carry the blood through the tissue and organs. It consist of veins, arteries and it is done by capillary action. Choroid is a pigmented vascular layer of the eyeball between the retina and the sclera. Sclera is a white outer layer of the eyeball. The front of the eye is continuous with the cornea. Fovea is a small depression in the retina of the eye where visual activity is at its highest. Optic nerve is each of the second pair of cranialnerves, it transmits impulses to the brain from the retina and back to the eye.===