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16
Humphrey Matrix Visual Field Instrument
Rev. D 08/21/06 PN 701692
4 TEST RESULTS AND RELIABILITY MEASURES
VISUAL FIELD TESTS SUMMARY
The table below summarizes the various FDT visual field tests available on the Humphrey Matrix
Visual Field Instrument. Sample printouts for all the tests listed are included at the end of this
User’s Guide for your reference.
The screening tests provide qualitative results regarding the patient’s visual function. Screening
tests are typically used for patients where no eye disease has been detected as part of a routine
eye examination. Threshold testing is used to obtain quantitative visual field results to confirm
the presence of eye disease and monitor visual function over time.
SCREENING TESTS
All of the Humphrey Matrix visual field FDT
screening
tests are
supra-threshold
tests meaning
that they test at specific age-corrected contrast values determined by the normative database
probability levels. Select the probability levels to use for screening for general clinical use to
maximize
sensitivity
(-5 uses the 5% probability level) or for population based screening to
maximize
specificity
(-1 uses the 1% probability level). The screening test results consist of
probability plots of the tested locations for each eye and overall reliability measures along with
patient and test information. The test locations indicate the different probability levels with
different patterns, increasing in darkness with decreasing probability level. Refer to the sample
printouts included at the end of this User’s Guide.
The
N-30-5 (or N-30-1) FDT screening test
is essentially the same 19-point rapid screening test
performed on the Humphrey FDT Visual Field Instrument, except that moving the fixation target
is not required with the Humphrey Matrix. The same normative database is used for the N-30
FDT Test
Visual
Field
Locations
Probability
Level
Classifications
Fixation
Catch
Trials
False
Positive
Trials
False
Negative
Trials
Test
Strategy
N-30-5,
N-30-1
Screening
19
4
3
3
0
Supra-
Threshold
24-2-5,
24-2-1
Screening
55
2
10
10
0
Supra-
Threshold
N-30-F
Threshold
19
4
6
6
3
MOBS
24-2
Threshold
55
4
10
10
6
ZEST
30-2
Threshold
69
4
10
10
6
ZEST
10-2
Threshold
44
4
10
10
6
ZEST
Macula
Threshold
16
4
6
3
0
ZEST
Summary of Contents for Humphrey matrix
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