Chapter 25: The Sensory System: Eye and Ear |DeWit: Medical-Surgical Nursing: Concepts & Practice, 3rd Edition

MULTIPLE CHOICE 1. Which component in the eye refracts light rays to be directed to the lens? a. Pupil b. Cornea c. Retina d. Ciliary body ANS: B The cornea bends or refracts the light rays onto the retina. The pupil acts to regulate the entrance of light into the eye. The ciliary body helps to change the shape of the eye for far and near vision. The retina is the inner coat of the eyeball and is found in the posterior portion of it. The retina contains several layers. The layer with rods and cones acts as the receptor for light images. PTS:1 DIF: Cognitive Level: Knowledge REF: 572 OBJ:1 (clinical) TOP: Cornea: Function KEY: Nursing Process Step: Implementation MSC: NCLEX: Health Promotion and Maintenance 2. A tonometer reading reflects the amount of pressure exerted by which component of the eye? a. Sclera b. Aqueous humor c. Vitreous humor d. Cornea ANS: B The tonometer reads the pressure exerted by the aqueous humor in the anterior chamber. The sclera is the part of the eyeball that is opaque white and covers the posterior portion of the eyeball. The vitreous humor is the substance found in the posterior chamber of the eye between the lens and the retina. The cornea is a transparent structure in the eye that allows light to hit the lens. It is involved in the bending of light rays. PTS:1 DIF: Cognitive Level: Comprehension REF: 572, 577, Table 25-2 OBJ:1 (theory) TOP: Optic Pressure KEY: Nursing Process Step: Implementation MSC: NCLEX: Health Promotion and Maintenance 3. During examination of the fundus of the eye, the nurse assesses a choked disc. Which statement accurately explains the significant of this finding? a. The disc has an infarct. b. There is increased intracranial pressure (ICP). c. There is significant hypertension. d. The lens has become opaque. ANS: B Visualization of the optic disc provides information about the pressure within the eye and within the skull. When ICP gets higher, the optic disc appears “swollen” or “choked.” PTS:1 DIF: Cognitive Level: Comprehension REF: 572 OBJ:2 (theory) TOP: Fundus Assessment: Choked Disc KEY: Nursing Process Step: Assessment MSC: NCLEX: Health Promotion and Maintenance 4. An office assistant tells the nurse his job requires him to work at his computer for 7 to 8 hours each day. Which statement indicates that the nurse’s teaching about preventing eyestrain has been successful? a. “I will wear protective goggles while working.” b. “I will eat more carrots and cooked spinach.” c. “I will close my eyes every few hours.” d. “I will instill artificial tears each hour while working.”