NURS 612 Chapter 12: Eyes
MULTIPLE CHOICE 1. Contraction or relaxation of the ciliary body: a. allows voluntary blinking. b. changes lens thickness. c. regulates peripheral vision. d. sends light impulses to the brain. e. regulates tear production. ANS: B The lens is circularly supported by a framework of fibers from the ciliary body, and contraction or relaxation of this structure results in a change in the thickness of the lens, allowing for accommodation as needed. Voluntary blinking, peripheral vision, tear production, and impulses to the brain are not controlled by the ciliary body. TOP: Discipline: Physiology MSC: Organ System: Nervous 2. Term infants have a visual acuity of about: a. 20/20. b. 20/100. c. 20/200. d. 20/300. e. 20/400. ANS: E Term infants are hyperopic, with a visual acuity of less than 20/400. TOP: Discipline: Physiology MSC: Organ System: Nervous 3. At what age does an infant usually develop the ability to distinguish color? a. At birth b. 2 months c. 6 months d. 12 months e. 16 months ANS: C By 6 months of age, vision has developed so that colors can be differentiated. TOP: Discipline: Physiology MSC: Organ System: Nervous 4. An increased level of lysozyme in the tears will occur normally during which life stage? a. Adolescence b. Childhood
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