AutoPeri(NM)
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‘Clover leaf’ pattern associated with false negatives
© Thomas R
Using the grey scale
•To educate the patient
•White scotomas with false positives
•Clover leaf pattern with false negatives
•Never interpret using the grey scale alone
© Thomas R
Questions
•Is there a field defect?
•Is it due to glaucoma?
•Is the defect progressing?
© Thomas R
Is the field abnormal?
•Without obvious defects, it is difficult to make a decision based on the first field
•Repeat examinations provide definitive information
•Never make a diagnosis based on the visual field alone
© Thomas R
Interpret the field systematically using zones 1–8
© Thomas R
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AGE |
57 |
2 |
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FIXATION LOSSES |
0/24 |
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FALSE POS ERRORS |
0/14 |
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FALSE NEG ERRORS |
1/13 |
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QUESTIONS ASKED |
449 |
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FOVEA: 33 DB |
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TEST TIME |
13:59 |
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© Thomas R
3
•Just glance at the grey scale and move on to zones 4 & 5
•Never interpret using the grey scale alone
©Thomas R
Zone 4: total deviation
•Point-by-point difference from the expected value for age-related normal individuals
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Reveals generalised depression
Cannot confirm a scotoma
Look at the number and pattern of symbols
© Thomas R
Normal ‘hill’ of vision
180° |
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0° |
40 dB |
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30 |
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20 |
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10 |
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0 |
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90 |
60 |
30 |
0 |
30 |
60 |
90 |
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© Thomas R |
Generalised depression
180° |
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0° |
40 dB |
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30 |
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20 |
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10 |
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0 |
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90 |
60 |
30 |
0 |
30 |
60 |
90 |
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© Thomas R |