The eyeball has three layers, each of which has several important structures that are essential for the sense of vision. This is a strong layer of tissue that covers nearly the entire surface of the eyeball. Vision is by far the most used of the five senses and is one of the primary means that we use to gather information from our surroundings.
These muscles move the eye up and down and side to side, and rotate the eye. The extraocular muscles are attached to the white part of the eye called the sclera. The eye sits in a protective bony socket called the orbit. Although the eye is small, only about 1 inch in diameter, each part plays an important role in allowing people to see the world. More than 75% of the information we receive about the world around us consists of visual information. The eyeball houses the retina —an extremely metabolically active layer of nerve tissue made up of millions of light receptors (photoreceptors)—and all of the structures needed to focus light onto it. It is approximately 25 mm in diameter and sits snugly in the orbit where six muscles control its movement. Parts of the eye. The eyeball is a round gelatinous organ that contains the actual optical apparatus. Eyeball, spheroidal structure containing sense receptors for vision, found in all vertebrates and constructed much like a simple camera. Six extraocular muscles in the orbit are attached to the eye.
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