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Methods Block 12 > Basics Of VF Interpretation > Flashcards

Basics Of VF Interpretation Flashcards

1
Q

When is perimetry utilized

A

Glaucoma
Neurological disease
Retinal disease

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2
Q

Role of perimetry in glaucoma

A
  • fundamental in diagnosis and management
  • perimetric test results that reproducibly demonstrate VF loss remain the most conclusive contributor to glaucoma diagnosis
  • the most precise method for quantifying glaucomatous progression remains repeated VF testing
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3
Q

When do you use a SITA standard 30-2

A

Measures visual sensitivity at 76 locations within 30 degrees of fixation-the area commonly referred to as the central visual field

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4
Q

When do you use SITA standard 24-2

A

The 24-2 pattern tests 54 locations and is identical to the 30-2 pattern except that most of the outermost ring of potions has been removed

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5
Q

SITA-FAST 24-2

A
  • the primary difference between the SITA standard and SITA fast strategies is the amount of certainty that is required before testing can be stopped
  • overall effect usually is reduced testing time without loss f diagnostic information
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6
Q

SITA FAST 24-2 is less tolerant of what

A

Patient mistakes and may be best used in experienced or younger patients

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7
Q

Which is more difficult, SITA fast to SITA standard

A

SITA fasts presents stimuli that more often are just barely visible, and may be a more difficult test than SITA standard
-therefore SITA fast is not the preferred choice in patients expected to have difficulty with perimetric testing

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8
Q

SITA-standard 10-2

A
  • covers only the area within 10 degrees of fixation using a grid of test points spaced every 2 degrees
  • valuable when evaluating VF loss in macular disease
  • late stage glaucoma
  • SITA FAST 10-2
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9
Q

Testing for drug induced maculopathy

A

Good for hydroxychloroquine using patients

10-2

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10
Q

Disability testing and VF

A

Some people want to be on disability, or for driving

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11
Q

Retinal disease and 24-2

A

VF testing has a role in the diagnosis and management of some retinal disease,s but direct observation and imaging of the fundus usually are of a greater values
-perimetry then becomes one of many ancillary tests

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12
Q

What kind of testing for visibility

A

Suprathreshold

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13
Q

A test is which the only goal is to confirm that visual function is not below the normal range

A

Suprathreshold testing

  • does not provide quantitative data
  • are not as sensitive to early field loss as threshold tests
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14
Q

Selecting a test for VF

A

-threshold testing is always a good choice, and in sopthalmic clinical settings, it is almost always to be preferred over suprathreshold screening tests

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15
Q

Standard of care for patients that’s have established field loss

A

Threshold testing

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16
Q

Most common VF test used

A

24-2

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17
Q

Normal time for SIAT fast

A

2-5 minutes

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18
Q

Time for standard Sita 24-2

A

5-7 minutes

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19
Q

Why switch to a 10-2 for late stage glaucoma

A

Peripheral vision is already gone, not sense in going through the whole thing

20
Q

VF for macular disease

A

10-2

21
Q

Perimetric follow up

A

It is usually best to follow a patient over time using the same test that was used for diagnosis

22
Q

Why do we need to use the same test every time we test a patient

A

If a patient is consistently examined with the same test strategy and test pattern, then tests can be more easily compared using standardized progression analyses

23
Q

Measures the tendency of patients to press the response button even when no stimulus has actually been seen

A

False positive

24
Q

Trigger happy

A

False positive

25
Q

Most important and used of the three available reliability indices

A

False positives

26
Q

Assess patient inattention

A

False negative errors

27
Q

Help identify patients who have failed to persons to stimuli that probably should have been seen

A

False negative

28
Q

Measures patient gaze stability, whether the patient is gazing straight ahead or looking from side to side during the test

A

Fixation losses

29
Q

An automatic dual-variable gaze tracker

A

Measures gaze direction every time a stimulus is presented

30
Q

False negatives in glaucoma

A

Can be high in glaucoma even if they are paying attention

31
Q

On the gaze tracking record, lines extending upward

A

Indicates the amount of gaze error during each stimulus presentation, with full scale indicating gaze errors of 10 degrees

32
Q

On the gaze tracking record, lines extending downward

A

Indicate that’s the instrument was unsuccessful in measuring gaze direction during that particular stimulus presentation, for instance, because of a blink

33
Q

This presentation simply shows the measured decibel sensitivity at each tested point, and is the basic information upon which all the analyses and printouts are based

A

Numerical threshold sensitivities

34
Q

These highlight loss after first correcting for any overall change in the height of the hill of vision, such as that caused by cataract

A

Pattern deviation maps

35
Q

Single most useful STATPAC analysis when glaucoma is suspected

A

The pattern deviation probability plot

36
Q

Comparing total deviation and pattern deviation

A

If the two maps look more or less the same, then there is little or no generalized depression
-on the other hand, a uniformly depressed total deviation map combined with a normal-looking pattern deviation map probability infdicates a cataract

37
Q

A pattern deviation map that looks more disrupted than its corresponding total deviation map

A

Often associated with a trigger happy patient who has repeatedly pressed the response button when no stimulus was seen

38
Q

Mean deviation

A

Weighted average of the values eprestned in the total deviation numerical plot, with 0 indicating no deviation from normal and larger negative values being associated with advanced field loss

39
Q

When is MD primary used for

A

Stage VF loss and as a metric for rate of change over time

-approximately 0 dB in normal and -30dB to -35 dB in extreme filed loss

40
Q

Visual field index

A

An enhancement of MD that is designed to be less affected by cataract and more sensitive to changes near the center of the field, in order to better correlate with ganglion cells loss

41
Q

Normal vision is associated with VFI clauses near _____

A

100%

42
Q

Pattern standard deviation (PSD) summarizes

A

Localized loss in a single index, which ignoring generalized depression
-low in normal fields, for uniformly depressed fields and for blind fields, and is highest in moderate to advanced localized loss

43
Q

Expert system for analyzing threshold test results

A

The glaucoma hemifield test
-it has been reported to detect glaucomatous VF loss with both high sensitivity and high specificity and expresses its analysis in plain language

44
Q

The single best place to look for practitioners who are not highly experienced at visual field analysis

A

Glaucoma hemifield test

45
Q

The GHT was not designed for what

A

Toe be sensitive to neurological or retinal field loss

Methods Block 12 (4 decks)

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