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Chapter 7: The Visual System

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

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

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

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

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

Retinal ganglion cell axons leave the eye at the

A. optic disk

B. fovea

C. macula

D. optic nerve

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

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

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

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

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

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.

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

A. Ganglion cell layer

B. Bipolar layer

C. Pigment epithelium

D. Layer of optic nerve fibers

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

A. Nasal hemiretina

B. Temporal hemiretina

C. Superior retina

D. Inferior retina

The lateral geniculate nucleus receives input from


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