522
As you glance at the person sitting next to you in class, light reflected from the person's shirt first passes through which three structures of your eye? · pupil, iris, lens Incorrect · cornea, iris, pupil Incorrect · cornea, pupil, lens (True Answer )Correct · fovea, iris, pupil Incorrect
523
In _____, an abnormally curved eyeball results in blurry vision for lines in a particular direction. · presbyopia Incorrect · astigmatism (True Answer )Correct · myopia Incorrect · hyperopia Incorrect
524
How do glasses correct visual problems? · Glasses correct vision by amplifying the frequencies of incoming light waves, which magnifies and enlarges the image that falls on the retina. Incorrect · Glasses correct vision by intercepting and bending incoming light waves so that they are focused properly on the retina. (True Answer )Correct · Looking through the corrective lenses exercises the muscles of the eye, aligning the eye structures properly. Incorrect · The corrective lenses diffuse the incoming light, which causes the pupil to widen and let in more light waves, enhancing visual acuity. Incorrect
525
The sensory receptors for vision are: · found in the pupil. Incorrect · the rods and cones of the retina. (True Answer )Correct · found in the lens and cornea. Incorrect · distributed throughout the inner eye. Incorrect
526
Each eye contains about _____ rods and about _____ cones. · 7 million; 125 million Incorrect · 25; 200 Incorrect · 1 million; 3 million Incorrect
· 125 million; 7 million (True Answer )Correct 527
Rods are used for vision in _____ light, and cones are used for vision in _____ light. · bright; dim Incorrect · black; white Incorrect · dim; bright (True Answer )Correct · colorful; black and white Incorrect
528
The visual sensory receptor cells that transform light energy into a neural signal are the: · bipolar cells in the blind spot. Incorrect · ganglion cells in the optic disc. Incorrect · bipolar cells in the optic nerve. Incorrect · rods and cones in the retina. (True Answer )Correct
529
Identify the sequence that correctly represents the path taken by light signals through the eye. · lens, pupil, optic nerve, retina Incorrect · cornea, pupil, lens, retina (True Answer )Correct · cornea, lens, iris, retina Incorrect · lens, iris, retina, pupil Incorrect
530
The thin, light-sensitive membrane that lies at the back of the eye and contains the sensory receptors for light is the _____. · fovea Incorrect · optic disk Incorrect · retina (True Answer )Correct · optic nerve Incorrect
531
What happens when rods and cones are exposed to light? · They undergo accommodation. Incorrect · They undergo a chemical reaction that results in a neural signal. (True Answer )Correct · They become more light-sensitive and thus cause an increase in visual acuity. Incorrect · They create problems with dark adaptation in the fovea. Incorrect
532
Rods and cones are: · the sensory receptor cells for vision, found in the retina. (True Answer )Correct · the sensory receptor cells for hearing, found in the cochlea. Incorrect · the tiny bones of the middle ear. Incorrect · the sensory receptor cells for taste, embedded in the taste buds. Incorrect
533
Which type of sensory receptors are involved in color vision? · trichromatic cells Incorrect · cones but not rods (True Answer )Correct · rods but not cones Incorrect · both rods and cones Incorrect
534
Rods are to cones as _____ is to _____. · slow adaptation; quick adaptation (True Answer )Correct · vision in bright light; vision in dim light Incorrect · less sensitive to light; more sensitive to light Incorrect · color vision; visual acuity Incorrect
535
Cones are most concentrated in the: · periphery of the eye. Incorrect · optic disk. Incorrect · optic chiasm. Incorrect · fovea. (True Answer )Correct
536
What region of the eye has the largest concentration of cones? · the periphery Incorrect · the iris Incorrect · the optic nerve Incorrect · the fovea (True Answer )Correct
537
The brain receives less detailed information from the _____ than from the _____.
· lens; cones Incorrect · cones; rods Incorrect · rods; cones (True Answer )Correct · cones; lens Incorrect 538
Rods are to cones as _____ is(are) to _____. · peripheral vision and night vision; color vision and visual acuity (True Answer )Correct · color vision and night vision; bright light conditions Incorrect · bipolar cells; ganglion cells Incorrect · color vision and visual acuity; peripheral vision and night vision Incorrect
539
The blind spot is caused by: · diabetes. Incorrect · the absence of rods or cones at the point where the optic nerve leaves the eye. (True Answer )Correct · malformation of the eyeball. Incorrect · degeneration of the optic nerve. Incorrect
540
What is the optic disk? · a tiny spot in the center of the fovea where there is a high concentration of rods and cones Incorrect · the portion of the lens that focuses incoming light Incorrect · the point at which the optic nerve fibers leave the back of the eye (True Answer )Correct · a transparent membrane that lies just behind the pupil of the eye and that helps funnel light waves to the lens and retina Incorrect
541
What does the optic disk cause? · our color vision Incorrect · our night vision Incorrect · our blind spot (True Answer )Correct · our light adaptation Incorrect
542
The blind spot: · increases in size with age. Incorrect · is caused by nearsightedness. Incorrect · is a small gap in our field of vision. (True Answer )Correct · can be cured with laser surgery. Incorrect
543
We have a blind spot in our field of vision, but we ordinarily don't notice it. What “fills in” the missing visual information? · the bipolar cells Incorrect · the optic disk Incorrect · the ganglion cells Incorrect · the brain (True Answer )Correct
544
Visual acuity is highest when images are focused on the fovea because of the high concentration of _____ in that region. · rods Incorrect · bipolar cells Incorrect · cones (True Answer )Correct · peripheral cells Incorrect
545
Your friend shows you an old coin that he found in his greatgrandfather's attic. To examine it, you instinctively bring the coin close to your eye and to the very center of your visual field. Why? · Visual acuity is highest in the region with the largest concentration of rods, which is the fovea at the very center of the eye. Incorrect · Visual acuity is highest in the region with the largest concentration of cones, which is the fovea at the very center of the eye. (True Answer )Correct · You want to avoid focusing the image on your blind spot. Incorrect · You need to avoid focusing the image on the optic disk. Incorrect
546
Which of the following is(are) most involved with visual acuity? · rods Incorrect · cones (True Answer )Correct · bipolar cells Incorrect