Visual Fields - Island of Vision and Specification of Stimuli (M1)

Question 1

What is the normal extent of the superior visual field (in degrees)? 1. Inferior? 2. Nasal? 3. Temporal? 4

Answer 1

1. 60deg
2. 75deg
3. 60deg
4. 100deg

Question 2

What is the maximum stimulus luminance (reference luminance) for a Humphrey?

Answer 2

10,000asb

Question 3

How many cd/m^2 is 1 apostilb (asb) equal to? 1. What is the luminance of a VA chart equal to in cd/m2? 2

Answer 3

1. 10 cd/m2

2. 85 to 150 cd/m2

Question 4

Which Goldmann notation stimulus size is the largest?

Answer 4

V (64mm2)

Question 5

What type of filter is changed by the letters on the Goldmann perimeter? 1. How much of a change does this cause in log units? 2

Answer 5

1. fine filter

2. 0.1 log unit

Question 6

Which Goldmann notation stimulus size is used for plotting a blind spot?

Answer 6

0 (1/16mm2)

Question 7

What are the factors that influence stimulus detection for visual fields?

Answer 7

1. stimulus size
2. stimulus luminance
3. background luminance
4. stimulus position
5. stimulus focus
6. presentation time
7. speed of movement (kinetic perimetry)
8. stimulus color

Question 8

What is the background luminance for a Goldmann perimeter? 1. What is the maximum stimulus luminance (reference luminance)? 2

Answer 8

1. 31.5asb

2. 1,000asb

Question 9

What is the outline of the limits or extent of the visual field within which a certain size and intensity of test stimulus can be seen?

Answer 9

isopter

Question 10

Which Goldmann notation stimulus size is most commonly used, including for HFA testing?

Answer 10

III (4.0mm2)

Question 11

What does each Roman Numeral change in the area of Goldmann stimuli represent? 1. What is this equal to? 2

Answer 11

1. change in area of 4x

2. one coarse filter step (5 dB)

Question 12

What percentage of the 0dB stimulus is 1dB? 1. 20dB? 2. 30dB? 3. 3dB? 4

Answer 12

1. 80%
2. 1%
3. 0.1%
4. 50%

Question 13

What is the brightest combination of filters for a Goldmann perimeter?

Answer 13

4e

Question 14

How many decibels is equal to one log unit of apostilbs?

Answer 14

10 dB

Question 15

What is the portion of space in which objects are simultaneously visible to the steady fixating eye called?

Answer 15

visual field

Question 16

What type of filter is changed by the numbers on the Goldmann perimeter? 1. How much of a change does this cause in log units? 2

Answer 16

1. coarse filter

2. 0.5 log unit

Question 17

What are apostilbs a measure of?

Answer 17

luminance