AutoPeri(NM)
.pdf
•Both MD and PSD are derived from the total deviation plot
•However, they provide different types of information
© Thomas R
Global indices: mean deviation (1)
•Average of all the numbers in the total deviation plot
•Indicates overall deviation of the visual field from normal
•Positive numbers indicate an ‘elevated’ field
•Negative numbers indicate a ‘depressed’ field
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–2.18 dB |
PSD |
4.63 dB; p < 1% |
SF |
1.24 dB |
CPSD |
4.44 dB; p < 0.5% |
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© Thomas R
Global indices: mean deviation (2)
•Provides similar information to total deviation
•Cannot confirm the presence of a scotoma
|
–2.18 dB |
PSD |
4.63 dB; p < 1% |
SF |
1.24 dB |
CPSD |
4.44 dB; p < 0.5% |
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© Thomas R
Global indices:
pattern standard deviation (1)
•Also derived from the total deviation plot
•Indicates the degree to which the numbers differ from each other
•Highlights ‘roughness’ or ‘pot-holes’ in the hill of vision
MD |
–2.18 dB |
PSD |
4.63 dB; p < 1% |
SF |
1.24 dB |
CPSD |
4.44 dB; p < 0.5% |
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© Thomas R
Global indices:
pattern standard deviation (2)
•Provides similar information to the pattern deviation
•Calls attention to scotomas
MD |
–2.18 dB |
PSD |
4.63 dB; p < 1% |
SF |
1.24 dB |
CPSD |
4.44 dB; p < 0.5% |
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© Thomas R
Global indices: short-term fluctuation
•Intra-test error in threshold determination
•Standard deviation of 10 predetermined points that are each tested twice
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24 |
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27 |
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29 |
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32 |
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26 |
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(31) |
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(30) |
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21 |
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28 |
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26 |
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(32) |
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0 |
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(31) |
(33) |
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(32) |
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(30) |
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20 |
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23 |
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(30) |
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(31) |
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25 |
28 |
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28 |
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25 |
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© Thomas R |
Global indices: corrected pattern standard deviation
•CPSD is PSD corrected for the SF
–If SF is due to unreliability, then CPSD is better
–If SF is due to pathology, then PSD is better
© Thomas R
Review of key points
MD
Total deviation plot
PSD
Pattern deviation plot
Generalised depression Can suspect a scotoma
Local irregularity Confirms scotoma
© Thomas R
Glaucoma Hemifield Test
© Thomas R
Zone 7: Glaucoma Hemifield Test
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© Thomas R