Zeiss HUMPHREY 720i, User Manual

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4-12 TEST PARAMETERS AND STRATEGIES
REV.B 02/03 PN 51680-1 HUMPHREY FIELD ANALYZER II - i series
Patient selection for Blue-Yellow perimetry has been found to be appropriate for early glaucoma detection in:
blue-yellow perimetry
• ocular hypertensives
• glaucoma suspects
• glaucoma patients with mild to moderate field loss.
1-5
While Blue-Yellow perimetry has the potential of becoming the primary perimetry method used
in glaucoma management, we recommend that it be done as a complement to standard
Humphrey white-on-white testing until more clinical experience has been gained.
For Neurological Disease:
At least one study has demonstrated that Blue-Yellow testing may be an appropriate and useful
test in neurological disease
6
. With greater clinical experience, Blue-Yellow testing may become
the primary perimetric testing method in neurological disease; initially, however, it should be
used as an adjunct to standard perimetry.
Patients who may not be candidates:
There are some patients who may not respond well to Blue-Yellow perimetry. This includes
patients with:
• significant cataracts
• advanced White-on-White field loss.
The procedure for testing with Blue-Yellow perimetry is identical to the procedure for testing
with white-on-white. One important, additional step is to explain to the patient what to look for.
The stimulus may appear as a localized color change (from yellow to violet) or sometimes as
an achromatic spot. Users might find it helpful to use the Demo feature or a foveal threshold
test to show patients what the new stimulus looks like before testing.
Many patients prefer the standard white-on-white perimetry, even though SWAP testing
conditions are no brighter than standard indoor lighting levels. If patients understand what to
expect they are much more accepting of new technologies — especially if they also understand
that they will benefit in the process. We believe that when your patients have been properly
informed about the benefits of Blue-Yellow perimetry, they will adapt to the new test quite well.
When Blue-Yellow testing is activated:
• the bowl illumination changes to yellow
• the stimulus color changes to blue
• the stimulus is changed to Size V (Blind spot check size also changes to Size V)
• Short-term Fluctuation (SF) is turned OFF.
These are the standard settings for performing Humphrey Blue-Yellow perimetry.
Blue-yellow testing
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