chapter 18 visual assessment

Question 1

The standard testing distance of 20 feet is used to test visual acuity because:
a) this is the distance at which the letters subtend 5 minutes of arc
b) this is the length of most eye exam rooms c) this relaxes accommodation
d) this stimulates accommodation

Answer 1

c- this relaxes accommodation

Question 2

A person with 20/80 vision:
a) sees at 80 feet what the normal eye can see at 20 feet
b) sees at 20 feet what the normal eye can see at 80 feet
c) can see better than 20/20
d) has a refractive error

Answer 2

B- sees at 20 feet what the normal eye can see at 80 feet

Question 3

The standard acuity chart or projector can produce a falsely high sense of the patient’s usable vision because:
a) it is low contrast
b) it is high contrast
c) it does not have any contrast
d) it is more accurate than a potential acuity meter reading

Answer 3

b- it is high contrast

Question 4

The “crowding phenomenon” affects the visual acuity of patients with:
a) astigmatism
b) strabismus
c) amblyopia
d) ametropia

Answer 4

c- ambylopia

Question 5

The presence of vision in an infant may be tested by:
a) noting the child’s reaction to his or her mother
b) noting the child’s reaction if his or her mother leaves the room
c) seeing if the child’s eyes follow a moving light
d) seeing if the child’s eyes follow a squeaking toy

Answer 5

c- seeing if the Childs eyes follow a moving light

Question 6

All of the following are true regarding the preferential looking test (using Teller or similar visual acuity cards) except:
a) it may be used for any nonverbal patient, infant or otherwise
b) the patient will automatically look at the card with the stripes
c) there is a tendency to underestimate vision with this test
d) the stripes are graded for finer and finer acuity

Answer 6

c- there is a tendency to underestimate vision with this test

Question 7

Which of the following is appropriate when testing a preschooler for amblyopia?
a) single Allen cards
b) isolated projected figures
c) a full line of figures
d) single Es

Answer 7

c- a full line of figures

Question 8

When testing the vision of a child with the Allen cards, a difference in the testing distance of how many feet between the eyes is considered significant?
a) 1 foot
b) 2 feet
c) 3.5 feet
d) 5 feet

Answer 8

d- five feet

Question 9

Before performing a PAM test, it is important to:
a) set the eye piece
b) enter the patient’s refractive error
c) calibrate the unit
d) have the patient wear his or her best correction

Answer 9

b- enter the patients refractive error

Question 10

Which of the following is not true regarding the pinhole?
a) If vision improves with the pinhole, a refractive error is present.
b) It compensates for media opacities.
c) It can be used if a patient has forgotten his or her glasses.
d) It increases contrast.

Answer 10

b- it compensates for media opacities