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COT > Visual Field Testing 4% > Flashcards

Visual Field Testing 4% Flashcards

1
Q

*Point of fixation

A

Fovea
(Had a couple question about fovea, including both fovea’s traveling the same pathway)

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2
Q

Blind spot

A

Optic Nerve

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3
Q

VF is recorded from _________point of view.

A

Patient’s

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4
Q

VF: Blind spot prints on the____ for OD and the ____ for OS.

A

Right for OD
Left for OS

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5
Q

________visual field is opposite the blind spot.

A

Nasal

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6
Q

*Normal blind spot________ degrees temporal and _____ degrees inferior to fixation.

A

15
1.5

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7
Q

*VF that does not cross _________meridian indicates Neurological/brain issue

A

Vertical

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8
Q

*VF that does not cross _____________ indicates Retinal or optic nerve problem.

A

Horizontal Raffe

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9
Q

*Amsler Grid evaluates __________ degrees of the VF using ____degree (5mm)spaced grid, holding out about 12”-14”.

A

20
1

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10
Q

Gross VF assessment using fingers, checked monocularly, documented from pt point of view.

A

CVF(Confrontation VF testing)

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11
Q

VF: Stationary stimulus (non moving)

A

Static

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12
Q

VF: Moving stimulus (like bleph field in Chas)

A

Kinetic

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13
Q

CVF fields are ____degrees superior, ____degrees inferior, ___degrees nasal, _____degrees temporal.

A

60, 70, 60, 90

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14
Q

_______, Swedish Interactive Threshold Algorithim, Combined with Standard Automated Perimetry (SAP). Faster test time without reduction in data quality.

A

SITA

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15
Q

Automated Perimetry that uses varying level of stimuli. The dimmest stimuli the patient responds to at least 50% of the time sat each point in the VF is their ‘threshold’ for that point. Stair step illumintion.

A

Threshold Perimetry

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16
Q

Automated Perimetry that filters out overall depression to how focal areas damage. Differentiates glc and other defects from ‘global depressions’ such as CAT. Shows just focal areas of damage on print out. Filters out global depression.

A

Pattern Deviation

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17
Q

VF: False Positives

A

Pt responds when no stimulus is presented.
Pt may be anxious. Reassure, reinstruct.
Pt may not have understood instructions. Reinstruct.
Pt responded.

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18
Q

VF: False Negative

A

Patient does not respond to a very bright light at same point at which previously responded to a dimmer light.
Pt may be fatigued. Rest, coach, reschedule.
Pt may be distracted. Take a break, reinstruct.

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19
Q

VF: Fixation losses

A

Check that fellow eye is patched properly.
Retry to find blind spot. If continued fixation losses: Pt may be distracted, anxious or fatigued. Coach and reinstruct.

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20
Q

VF: Artifacts

A

Lids- lashes-tape upper lid
Positioning error-Lens Rim: Place closest to eye without touching eyelashes. High plus pts best tested w/CL’s
Forehead
Chin

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21
Q

Goldmann Perimetry is what type of VF?

A

Threshold

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22
Q

Goldmann Perimetry uses_________code.

A

Alphanumeric

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23
Q

Goldmann Perimetry: Each step a-e represents a brighter illumination of ____log unit.

A

0.1 (1 dB) decibels

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24
Q

In Goldmann Perimetry each step 1-4 represents a ____log unit change in intensity.

A

0.5 (5dB)

25
Q

Goldmann Perimetry: _____________(20dB is 10 times brighter than 10dB)

A

Logarithmic

26
Q

In Goldmann Perimetry Roman Numerals indicate…..

A

Stimulus size (not brightness)

27
Q

Goldmann Perimetry: V4e for pt with …..

A

Hand motion VA

28
Q

Goldmann Perimetry: i1e for pt with

A

20/15 VA

29
Q

Apostible=

A

Unit of illumination

30
Q

Decibel (dB):
_____low senstivity/significant field loss
_____normal
_____high sensitivity/may be trigger happy

A

0-20
30
40-50

31
Q

Line connecting points that are of equal sensitivity to light.

A

Isopter

32
Q

A complete map of the VF with a given test illumination show an___________.

A

Isopter

33
Q

Apostilbs and dB are ________related.

A

Inversely

34
Q

0 dB=max stimulus on _____________ but absolutely to illumnation at all on _______________

A

Automated perimeters
Goldmann Perimeters

35
Q

How often should Goldmann VF test be calibrated?

A

Before every test

36
Q

Goldmann VF test facts:

A

Calibrate before every test
Calculate Trial lenses
Make sure pt comfortably seated, face in chinrest and vertical (no tilt)
Cover eye not being tested
Pt fixates on white fixation target at center of bowl.

37
Q

Goldmann VF Test:
Size of stimulus depends on……

A

Accuracy of patient’s fixation
Patient’s reaction time

38
Q

Goldmann VF test:
Young, 20/20 begin with ________mm white target.
Old, senile, 20/200 begin with ________or ____larger target.

A

1 or 2
10mm or 20mm

39
Q

In Goldmann Perimetry, always move________target from _________(non-seeing area) toward_______(seeing area).

A

kinetic
periphery
fixation

40
Q

Why should you move slowly with Goldmann VF test?

A

so lag time between pt’s first view of light and response is short

41
Q

Goldmann VF: Test approximately ___meridians ______ and _____ ____ sector. Carry test object to _________

A

12
peripherally
central 30
fixation point

42
Q

Goldmann VF: If target is _________ then you will have threshold defects, tire patient, and waste time. Never use target smaller than ____

A

too small
‘e’

43
Q

Center of blind spot is_________degrees temporal to fixation and ______degrees below horizontal meridian.

A

12-15
5

44
Q

True or False: You must remove lens when testing outside of central 30 degrees with Goldmann VF.

A

True

45
Q

In Goldmann VF: Pt should respond when test object________, when object _______ and when it ___________.

A

becomes visible
disappears
flickers or grays out

46
Q

Goldmann VF: The larger the target, the__________the VF.

A

Larger

47
Q

Why should you use the same target in follow up tests when doing VF.

A

It shows progression or regression of VF.

48
Q

Stationary stimulus

A

Static

49
Q

Moving stimulus

A

Kinetic

50
Q

Patient responds when no stimulus present

A

False positive

51
Q

Pt does not respond to a very bright light at same point at which previously responded to a dimmer light

A

False negative

52
Q

Causes of false positives
Solution

A

Anxious(reassure, reinstruct)
Didn’t understand instructions (reinstruct)

53
Q

Causes of false negative
Solution

A

Fatigue (test, coach, reschedule)
Distracted ( take a break, reinstruct)

54
Q

Pt responds to a stimulus that was shown in their previously mapped out blind spot

A

Fixation losses

55
Q

Causes and Solution for fixation losses

A

Pt distracted, anxious, fatigued
(Coach, reinstruct)

56
Q

Unit of illuminence

A

Apostilb

57
Q

A level of sensitivity

A

Decibel (dB)
0-20 low(significant field loss)
30 normal
40-50 high (trigger happy)

58
Q

A line connecting points that are of equal sensitivity to light

A

Isopter

COT (28 decks)

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