20. During a test for near-point accommodation, Subject A had an accommodation distance of 15 cm in both eyes, and Subject B had an accommodation distance of 30 cm. Which one is likely the younger person? Explain. 21. Explain why many vertebrates, including cows and domestic dogs and cats, have much better night vision than humans. 22. Describe the tests you would use to assess a patient's hearing acuity. What results would you expect if the patient's ability to hear and localize sounds was suspected to be below normal? 23. During a Weber test, the arm of a tuning fork was placed on the patient's forehead. She was able to hear the tone in the left ear, but not in the right ear. Explain what these results indicate.
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Describe the tests you would use to assess a patient's hearing acuity. What results would you expect if the patient's ability to hear and localize sounds was suspected to be below normal?
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