Visual Field Testing Strategies (M1) Flashcards
What is the difference between the threshold-related strategy and the quantify defects strategy?
same starting points but in quantify if missed on first try then threshold measured at that point
What are the different levels of automated static screenings?
- single intensity strategy
- threshold-related strategy
- 3 zone strategy
- quantify defects strategy
What are the two types of equipment/examiner controls?
- manual perimetry
2. automated perimetry
What is the stimulus dynamic that has the stimulus move from non-seeing to seeing area of the patient’s VF called?
kinetic
What is the threshold algorithm that the Humphrey Matrix uses?
ZEST
Which type of automated static screening strategy has the missed screening stimuli thresholded?
quantify defects strategy
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
- central reference level
- second most sensitive point
- use age-matched central reference level
What staircase methods does the SITA Standard use? 1. SITA Fast? 2
- 4dB and then 2dB
2. 4dB only
What defines the peripheral area of a perimeter test? 1. What are examples of testing this? 2
- VF beyond 30deg radius
2. often kinetic
What defines the central area of a perimeter test? 1. What are examples of testing this? 2
- central 30deg (radius) of VF
2. 30-2 or 24-2
What are the typical instruments used for threshold kinetic testing?
- Tangent screen
- arc perimeter
- Goldmann perimeter
- Octopus 900 Pro
- Humphrey field analyzer 3
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
- SITA Standard
2. SITA Fast
What are the most common testing patterns used for automated static threshold testing?
24-2 and 30-2
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
- 5.5 to 10 min
- 3 to 7 min
- 3 to 7 min
- 2 to 5 min
What is the starting point for the threshold-related strategy? 1. When is it marked as missed? 2
- 6dB brighter than expected threshold
2. missed on 2nd try
What type of testing quantifies sensitivity at each point tested? 1. What type of perimeter is usually required? 2
- threshold static perimetry
2. automater perimeter
What is the range of stimuli that the HFA II can present relative to the background luminance?
0.08asb (50dB) to 10,000 asb (0dB)
What is the stimulus duration for Humphrey threshold testing?
200 milliseconds
What are the threshold algorithms that the Octopus 900 uses?
- TOP
- adaptive
- 4-2-1 staircase
What is one of the disadvantages of the threshold-related screening strategy?
does not quantify defect depth
What are criteria for progressing to a threshold test following a screening?
- 2 or more adjacent missed points
- 1 or more misses within 20 deg of fixation
- central reference level of 26dB or less
What is the stimulus dynamic that uses stationary stimuli?
static
What is the 10-2 automated static threshold test useful for?
- small central scotoma is suspected
2. macula testing
