EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 46.2, Problem 3R
Summary Introduction
To review:
The changes in vision, if the optic chiasm is cut in the middle.
Introduction:
The optic chiasm is an X-shaped structure, where optic nerves from the two eyes cross each other. The optic nerve from the left eye goes to the right side of the brain and the optic nerve from the right eye goes to the left side of the brain. It is present just below the hypothalamus.
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What is the function of the optic chiasma?
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Three patients have suffered destruction of different portions of their visual pathway. Patient 1 has lost the right optic tract, patient 2 has lost the nerve fibers that cross at the optic chiasm, and patient 3 has lost the left occipital lobe. Draw a picture of what each person would perceive through each eye when looking at a white wall.
Chapter 46 Solutions
EBK LIFE: THE SCIENCE OF BIOLOGY
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- Larry goes to the doctor complaining that he cant see the right side of the visual field with either eye. Where in the visual signal-processing pathway is Larrys problem occurring?arrow_forwardWhat is meant by the statement Vision happens mainly in the brain?arrow_forwardWhich defect of vision can be rectified using a concave lens?arrow_forward
- Dr. Nakvarati used an instrument to blow a puff of air on Mr. Jefferson’s eye during his annual physical examination on his 60th birthday. The eye deformed very little, indicating that the intraocular pressure was too high. What was Mr. Jefferson’s probable condition?arrow_forwardidentify the structures listed with Figurearrow_forwardGeorge was under a lot of stress. His final semester examination was only 2 days away, and he was not prepared at all. To make matters worse, his right eyelid suddenly started twitching, and he couldn’t concentrate. Should George be worried about his eye? What is the reason behind this twitching?arrow_forward
- Why do some fibers project from the optic chiasm to the midbrain?arrow_forwardPresbyopia is a condition in which a person loses part or all of their capacity to adapt to changes in visual acuity. Will she still need reading glasses after having LASIK to fix her far vision? Explain.arrow_forwardMr. Smith, who is 68 years old, had almost lost vision in both his eyes. The doctor diagnosed his condition as the “dry” form of macular degeneration. Explain how this disorder results in the loss of vision.arrow_forward
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Visual Perception – How It Works; Author: simpleshow foundation;https://www.youtube.com/watch?v=DU3IiqUWGcU;License: Standard youtube license