Visual Field Testing Strategies (M1)

Question 1

What is the difference between the threshold-related strategy and the quantify defects strategy?

Answer 1

same starting points but in quantify if missed on first try then threshold measured at that point

Question 2

What are the different levels of automated static screenings?

Answer 2

1. single intensity strategy
2. threshold-related strategy
3. 3 zone strategy
4. quantify defects strategy

Question 3

What are the two types of equipment/examiner controls?

Answer 3

1. manual perimetry

2. automated perimetry

Question 4

What is the stimulus dynamic that has the stimulus move from non-seeing to seeing area of the patient’s VF called?

Answer 4

kinetic

Question 5

What is the threshold algorithm that the Humphrey Matrix uses?

Answer 5

ZEST

Question 6

Which type of automated static screening strategy has the missed screening stimuli thresholded?

Answer 6

quantify defects strategy

Question 7

What serves as the starting point for screening or threshold tests? 1. Which point is used for this? 2. What can be done to avoid this and save time? 3

Answer 7

1. central reference level
2. second most sensitive point
3. use age-matched central reference level

Question 8

What staircase methods does the SITA Standard use? 1. SITA Fast? 2

Answer 8

1. 4dB and then 2dB

2. 4dB only

Question 9

What defines the peripheral area of a perimeter test? 1. What are examples of testing this? 2

Answer 9

1. VF beyond 30deg radius

2. often kinetic

Question 10

What defines the central area of a perimeter test? 1. What are examples of testing this? 2

Answer 10

1. central 30deg (radius) of VF

2. 30-2 or 24-2

Question 11

What are the typical instruments used for threshold kinetic testing?

Answer 11

1. Tangent screen
2. arc perimeter
3. Goldmann perimeter
4. Octopus 900 Pro
5. Humphrey field analyzer 3

Question 12

What HFA threshold testing algorithm reduces the number of points shown without a reduction in data quality? 1. What is an even quicker version of this? 2

Answer 12

1. SITA Standard

2. SITA Fast

Question 13

What are the most common testing patterns used for automated static threshold testing?

Answer 13

24-2 and 30-2

Question 14

What is the typical test time range for SITA Standard 30-2? 1. SITA Standard 24-2? 2. SITA Fast 30-2? 3. SITA Fast 24-2? 4

Answer 14

1. 5.5 to 10 min
2. 3 to 7 min
3. 3 to 7 min
4. 2 to 5 min

Question 15

What is the starting point for the threshold-related strategy? 1. When is it marked as missed? 2

Answer 15

1. 6dB brighter than expected threshold

2. missed on 2nd try

Question 16

What type of testing quantifies sensitivity at each point tested? 1. What type of perimeter is usually required? 2

Answer 16

1. threshold static perimetry

2. automater perimeter

Question 17

What is the range of stimuli that the HFA II can present relative to the background luminance?

Answer 17

0.08asb (50dB) to 10,000 asb (0dB)

Question 18

What is the stimulus duration for Humphrey threshold testing?

Answer 18

200 milliseconds

Question 19

What are the threshold algorithms that the Octopus 900 uses?

Answer 19

1. TOP
2. adaptive
3. 4-2-1 staircase

Question 20

What is one of the disadvantages of the threshold-related screening strategy?

Answer 20

does not quantify defect depth

Question 21

What are criteria for progressing to a threshold test following a screening?

Answer 21

1. 2 or more adjacent missed points
2. 1 or more misses within 20 deg of fixation
3. central reference level of 26dB or less

Question 22

What is the stimulus dynamic that uses stationary stimuli?

Answer 22

static

Question 23

What is the 10-2 automated static threshold test useful for?

Answer 23

1. small central scotoma is suspected

2. macula testing