Figure 17.3 sed to demonatrale 9 Pupillary Reflexes 1. Face the subject and watc

Question

Figure 17.3 sed to demonatrale 9 Pupillary Reflexes 1. Face the subject and watch that individual's pupils; the subject closes the eyes and covers them with the hands. Norw os shine a penlight for desk lamp) into the subject's face, and at a signal the subject opens the eyes and looks into the light. What happens to the pupils? 2. Next, the subject holds the edge of an index card along the nose so as to divide the field of vision. Test the pupillary reflex of one eye using the penlight as just described. Does a comparable reflex occur in the noeillaminated eye? Do the pupils adjust independently or together? Superimposition Obrain a paper tube, such as a mailing case, about 3 cm in diameter and 45 cm long or roll a sheet of paper into such a tube. Keeping both eyes open, hold the tube up to one eye and look at some distant object through the tube, then bring the free hand up in front of the other eye and move this hand back and forth along thetube (hg.17.3). A hole will appear in your hand. Explain with reference to figure 17.4

Explanation / Answer

Both pupils react to light even if light is shown in only one eye

When light thrown in right eye in normal pupillary reflex right pupil constricts called direct pupillary reflex

While left eye pupil also constricts called as consensual pupillary reflex

Both pupils react simultaneously not independantly

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