Zeiss HUMPHREY 720i, Руководство пользователя

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7-8 STATPAC ANALYSIS & PRINTING RESULTS
REV. B 02/03 PN 51680-1 HUMPHREY FIELD ANALYZER II -
i
series
PSD stands for Pattern Standard Deviation. PSD is a measurement of the degree to which the
shape of the patient’s measured field departs from the normal, age-corrected reference field. A
low PSD indicates a smooth hill of vision. A high PSD indicates an irregular hill and may be
due either to variability in patient response or to actual field irregularities. The statistical
significance for PSD is indicated using the same categories for “p” as with the mean deviation.
SF is Short-term Fluctuation, which the Humphrey Field Analyzer measures during the test. It is
an index of the consistency of the patient’s responses during the test and is obtained by testing
twice at ten (10) pre-selected points. Categories for p values are the same as for MD. The SITA
testing strategies do not calculate SF. Therefore, only MD and PSD are available when using
SITA Standard or SITA Fast.
CPSD stands for Corrected Pattern Standard Deviation. It is a measure of how much the total
shape of the patient’s hill of vision deviates from the shape of the hill of vision normal for the
patient’s age, corrected for intra-test variability (SF). The hill of vision may be irregular in
shape because of unreliable patient responses, because of actual field losses, or a combination
of the two factors. Categories for “p” values are the same as for MD.
In calculating CPSD, STATPAC attempts to remove the effects of patient variability and to present
only the irregularity caused by actual field loss. CPSD depends on both PSD and SF and is,
therefore, not available unless the fluctuation option remains on during testing.
The overview printout The Overview printout can show the results of up to sixteen (16) tests. It condenses the
information shown in a Single Field Analysis and makes it easy to review a series of tests. The
tests are automatically printed in chronological order. The patient’s name, date of birth, type of
test, and eye tested appear at the top of the page. Results from 30-2 and 24-2 tests may be
presented in the same printout. STATPAC does not combine 10-2 with any other test patterns.
The Overview presents the results of each test in four formats: Graytone, Numeric, Total
Deviation probability plot, and Pattern Deviation probability plot. The date of the test appears
to the upper-left of the Graytone, and the visual acuity and pupil size are printed to the upper-
right of the Pattern Deviation probability plot. The GHT is printed to the right of the test date.
The foveal threshold, fixation losses, false negative errors, false positive errors, and global
indices appear below the test results. The legend to the probability symbols appear at the
bottom of the printout.
You may print Overviews of 24-2, 30-2, and 10-2 tests after using non-STATPAC stimulus sizes
I, II, IV, or V and non-STATPAC colors Blue or Red. In these cases graytone, numeric thresh-
olds, and defect depth are printed. No probability plots are available. You can also print
Overviews of Blue-Yellow test results.
Overview printouts cannot consist of a mixture of tests run with different stimulus sizes or
colors. Blue-Yellow tests may not be mixed with any white background test (including tests run
with a blue color stimulus). Blue-Yellow Overview printouts are labeled as such.
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