Glencoe Health 2005.pdf

Treatment includes corrective lenses vision therapy

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Treatment includes corrective lenses, vision therapy, or surgery. Diseases of the Eye Diseases of the eye range from easily treated infections such as sties and pinkeye to conditions that can threaten sight. A sty is an inflamed swelling of a sebaceous gland near the eyelash. Conjunctivitis, also known as pinkeye, is an inflammation of the conjunctiva, a thin membrane that covers the sclera lining of the eyelids. A serious threat to vision results from a detached retina. This occurs if a portion of the retina is separated from the choroid as a result of natural aging or from an injury. Warning signs include blurred vision or seeing bright flashes of light. Treatment includes using a laser to repair a tear or surgery to reattach the retina. Three other serious eye diseases are described on the next page. T he titles referring to peo- ple who work with eyes are very similar: Optician— technician who provides technical and patient services Optometrist— doctor of optometry (OD) who examines, diagnoses, treats, and manages diseases and disorders of the visual system Ophthalmologist— medical doctor who specializes in the medical and surgical care of the eyes and visual system HS_HEALTH_U05_C14_L3 12/6/03 9:54 AM Page 374
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Applying Health Skills Accessing Information. Research various community health services that provide vision screenings for all ages, such as Unite for Sight. Make a pamphlet that can be used as a reference on the availability and costs of these community services. Reviewing Facts and Vocabulary 1. List the structures that make up the three layers of the eyeball wall. 2. Give three examples of health behaviors you can practice to care for your eyes. 3. Explain the difference between myopia and hyperopia. Thinking Critically 4. Analyzing. How might having night blindness affect a person’s activities? 5. Applying. How could you demonstrate the effect of cataracts on vision? P R E S E N T A T I O N S O F T W A R E Using presentation software, you can include art and graphics to make an electronic slideshow. See health.glencoe.com for tips on how to use presentation software. Lesson 3 Eye Care 375 Glaucoma. The pressure inside the eye is normally main- tained by the aqueous and vitreous humor. In glaucoma, abnormally high pressure leads to irreversible damage of the retina and the optic nerve and can result in loss of sight. Regular eye checkups can lead to early detection and treatment to control the condition. Cataracts. In this condition the normally transparent lens becomes cloudy. The formation of a cataract interferes with the lens’ ability to focus light rays, making images appear blurry or vision seem foggy. Treatment of a cataract is typically the surgical removal of the old lens and replacement of it with a new, artificial lens.
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