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Unformatted text preview: Chloe Nguyen Professor Bush MEDA 115 12 April 2011 Chapter 5 1. The process of normal vision:- An image is formed on the retina- The rods and cones are stimulated- Nerve impulses are conducted to the brain 2. 4 main errors of refraction:- Hyperopia (Farsightedness)- Myopia (Nearsightedness)- Astigmatism- Presbyopia 3. Nystagmus is involuntary, repetitive, rhythmic movements of one or both eyes. Strabismus, a visual defect of misalignment, is failure of the eyes to look in the same direction at the same time, which primarily occurs because of weakness in the nerve stimulating the muscles controlling the position of the eyes. 4. The etiological factor: a staphylococcal infection. 5. Conjunctivitis: Inflammation, swelling, itching, burning, discharge and redness of the protective membrane - conjunctiva - that lines eyelid. I ts h ighly contagious. 6. Possible causes: foreign bodies, trauma, fingernail, contact lenses, etc. 7. Cataracts develop slowly and gradually reduce vision. The patient may report poor night vision, a yellowing or fading of colors, and the need for bright light for reading. In advanced cases, the cataract become visible giving the pupil a white, opaque appearance...
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- Fall '09