Intro to Visual Fields (M1)

Question 1

What is the testing capabilities of an Octopus 900 Pro? 1. What is the stimulus? 2

Answer 1

1. Threshold, screening, peripheral kinetic testing

2. white on white with monitor

Question 2

What are the advantages of an Octopus 900 Pro? 1. Disadvantages? 2

Answer 2

1. Does anything a Goldmann can do plus glaucoma and can import old Humphrey data
2. plots and data look different than normal (Humphrey)

Question 3

What perimeter uses frequency double perimetry?

Answer 3

Humphrey matrix perimeter

Question 4

What are the advantages of an Octopus 600? 1. Disadvantages? 2

Answer 4

1. can follow people with threshold and software to compare them
2. range of luminance of stimulus small because on a monitor

Question 5

What does a conservative instruction type given to the patient for automated perimetry result in?

Answer 5

1. lower sensitivity values

2. less false positives

Question 6

What ganglion cell pathway does frequency double perimetry stimulate? 1. Why is this a good way to detect glaucomatous damage? 2

Answer 6

1. magnocellular GC pathway

2. largest GC’s have less overlap of receptive fields and are more receptive to low spatial frequencies`

Question 7

What is the testing capabilities of a Goldmann bowl? 1. What is the stimulus? 2

Answer 7

1. kinetic or static testing (low vision used often)

2. light source with pantograph to mark points

Question 8

What does the name “frequency-doubling” come from?

Answer 8

illusion that there are 2x as many bars when it flickers

Question 9

What is the determination of the extent of the visual field for various types and intensities of stimuli for the purpose of diagnosing and localizing lesions in the visual pathway?

Answer 9

perimetry

Question 10

How much of a loss of sensitivity does one diopter of refractive blur result in?

Answer 10

one decibel loss

Question 11

What are the disadvantages of a Goldmann bowl perimeter?

Answer 11

1. expensive light bulbs and other equipment

2. no glaucoma management

Question 12

What is the testing capabilities of a Humphrey Field Analyzer? 1. What is the stimulus? 2

Answer 12

1. threshold tester, kinetic on newer ones

2. white on white

Question 13

What are the advantages of a Goldmann bowl perimeter?

Answer 13

1. can change brightness and size
2. can move light source
3. good for mapping a scotoma

Question 14

What is the arc perimeter used for? 1. What is the stimulus? 2

Answer 14

1. kinetic perimetry for driving tests

2. 10mm white dot along black arc

Question 15

What are the advantages of an arc perimeter? 1. Disadvantages? 2

Answer 15

1. can plot the 8 cardinal meridians in best way

2. no static perimetry or threshold and no following of a subtle defect

Question 16

What are the advantages of an Humphrey Field Analyzer? 1. Disadvantages? 2

Answer 16

1. can adjust lens and is the standard for glaucoma progression
2. somewhat clunky

Question 17

What is the testing capabilities of an Octopus 600? 1. What is the stimulus? 2

Answer 17

1. threshold testing and pulsar perimetry

2. white on white with monitor

Question 18

For presbyopes, what should the trial lens be compared to the distance Rx for the Humphrey Field Analyzer?

Answer 18

+3.25