Deck 37: Visual Tests and Demonstrations

Question 1

Which of the following is NOT true of colorblindness?

A)It is a hereditary trait carried on the X chromosome.
B)Protanopia involves a lack of or a decrease in sensitivity to the blue-sensitive cones.
C)Males and females can be colorblind, but the condition is more common in males.
D)Deuteranopia involves a lack of or a decreased sensitivity to green-sensitive cones.
E)All of these are true of colorblindness.

Answer 1

B

Question 2

As people age, the lenses of the eye thicken and lose elasticity, a condition called

A)hyperopia.
B)emmetropia.
C)myopia.
D)hypoopia.
E)presbyopia.

Answer 2

E

Question 3

Which of the following is NOT true of farsightedness?

A)It is caused by the eyeball being too long.
B)It is also called hyperopia.
C)When a person is farsighted, distant objects are clear, but close objects look blurry.
D)A convex lens is used to correct farsightedness.
E)All of these are true of farsightedness.

Answer 3

A

Question 4

A person with better than normal visual acuity may have a vision of

A)20/50
B)20/10
C)20/20
D)20/200
E)20/100

Question 5

During accommodation, it is normal for the eyes to diverge, to obtain a thorough view of the close object.

Question 6

The muscles of photopupillary reflex are innervated by the ________ nerve.

A)trochlear
B)oculomotor
C)optic
D)facial
E)abducens

Question 7

A defect in the curvature of the cornea or lens results in a condition called

A)emmetropia.
B)hyperopia.
C)myopia.
D)astigmatism.
E)presbyopia.

Question 8

About 7% of females are colorblind.

Question 9

Which of the following is NOT true of accommodation?

A)It refers to a change in the shape of the lens, as a person focuses on a near object.
B)When a person focuses on a close object, the lens becomes more spherical.
C)When accommodation occurs, tension is released on the suspensory ligaments holding the lens.
D)It is accomplished by a reflex in the iris.
E)All of these are true of accommodation.

Question 10

In the blind spot demonstration, when staring at the + sign with your right eye, and moving the figure closer to your face, the dot in the figure suddenly disappears when it is focused on the

A)fovea centralis.
B)optic disc.
C)ciliary body.
D)macula lutea.
E)peripheral retina.

Question 11

In the astigmatism test, astigmatism is present if some groups of radiating lines on the astigmatism chart appear red, while others appear black.

Question 12

The near point of accommodation increases with age.

Question 13

When a person focuses on a close object, the pupil constricts along with the normal accommodation reflex.

Question 14

Which of the following is NOT true of the photopupillary reflex?

A)The response is controlled by the parasympathetic division of the autonomic nervous system.
B)It occurs when a person suddenly enters an area with brighter lighting conditions.
C)The response is a decrease in the size of the pupil.
D)It involves contraction of the circular muscles of the iris.
E)All of these are true of the photopupillary reflex.

Question 15

Which of the following structures refract(s)light to focus it on to the proper area of the retina?

A)Iris
B)Ciliary body
C)Cornea and lens
D)Pupil
E)Optic disc and ciliary body