The space between the cornea and lens is called the anterior chamber and is filled with a watery fluid called aqueous. The cavity between the lens and retina is called the vitreous cavity because it is filled with a jelly-like substance called vitreous. The internal eye is filled a fluid type substance which nourishes and protects internal structures. Other important structures include the eyelids which protect and lubricate the eye the conjunctiva or lining of the eye the lacrimal gland which secretes tears and other protective substances the lacrimal sac which drains away tears and other debris. Six muscles move the eyeball and help coordinate it with the other. The soft tissue also enables the eye to turn easily in the orbit. The eyeball is set in a protective cone-shaped cavity in the skull called the orbit. Fatty tissue inside the orbit surrounds the eye and cushions it against blows and other injuries. The eyeball is only one part a complex visual system which is composed of the eye and surrounding structures, the brain, and all the connecting nerve pathways between it and the brain. The eye is extremely delicate, and like other organ systems in the body, it operates under very narrow physiologic parameters where temperature, blood flow, and other factors are delicately balanced. It can adjust its focus between a distant point and a near one. The human eye measures only about 1 inch in diameter, and yet it can see stars billions of light years away or tiny grains of sand. ![]() The eye is our most important organ for finding out about the world around us ! Sight is considered our most precious sense, and people fear blindness more than any other disability.
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