5/28/2023 0 Comments Fibrous tunic![]() The cornea and lens bend light todirect the imagewith the focal point being directly on the retina. Essentially the connection between the eyes and brain is one of a high efficiency recording of everything we see and experience beginning the day of birth. It consists of columnar epithelial cells, Kimberly Batchelor, cst The eyes of the human body serve to send a photographic memory to our brain. The lens is positioned directly pos- terior to the iris and pupil. Delicate fibers called the zonules or suspensory ligaments project inward from the ciliary pro- cesses to hold the lens in place. The fibers include cold and pain receptors, but no heat or touch receptors. However, the cornea has a good supply of sensory nerve fibers that enter at its margins and radiate to the center. Because the cornea contains no blood vessels it is transparent. It is composed of connective tissue whose surface is covered by a thin layer of epithelium. The function of the cornea is to focus the entering light rays. The cornea, referred to as the window of the eye, is part of the outer tunic. ![]() MARCH 2022 | The Surgical Technologist | 113 Age-RelatedMacular Degeneration L E A R N I N G O B J E C T I V E S s Read about the studies involving age-related eye disease s Review the anatomy and epidemiology of AMD s Explore the stages of age-related macular degeneration s Learn about the symptoms and detection methods of AMD s Evaluate the treatment methods for this type of disease O C U L A R A N A T O M Y T he eye consists of three layers – outer fibrous tunic, middle vascular tunic, and inner nervous tunic (see Figure 1).
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