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Chapter 7: The Visual System

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Which of the following statements best describes how a visual image is transmitted upon the retinal surface by the lens?

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A. The visual image is projected onto the retina without distortion.

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B. The image is reversed, from right to left only.

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C. The image is reversed from right to left and inverted from top to bottom.

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D. The image is inverted, from top to bottom.

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Retinal ganglion cell axons leave the eye at the

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A. optic disk

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B. fovea

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C. macula

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D. optic nerve

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A patient is blind in one eye. Which of the following does not describe the patient's visual fields?

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A. The visual field of the sighted eye corresponds precisely to one hemifield in a normally sighted individual.

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B. The monocular crescent of the sighted eye is not affected by blindness in the other eye.

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C. There is a loss of overlap of the two visual fields.

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D. The visual field of the sighted eye extends beyond the midline.

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Comment: The visual field of each eye normally extends beyond the midline, so that there is a central region of binocular overlap when the visual fields of each are are considered together. The monocular crescents of each eye are independent; they do not overlap with the other. That is why they are called monocular.

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A person with retinitus pigmentosa has a functional impairment in which retinal layer?

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A. Ganglion cell layer

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B. Bipolar layer

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C. Pigment epithelium

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D. Layer of optic nerve fibers

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Which of the following best describes the retinal location of all ganglion cells that send their axon across the midline in the optic chiasm?

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A. Nasal hemiretina

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B. Temporal hemiretina

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C. Superior retina

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D. Inferior retina

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The lateral geniculate nucleus receives input from

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A....

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