Zeiss humphrey HFA II-i series Field Service Manual page 453

Page 4 FA2i-026
5160 Hacienda Drive, Dublin, CA 94568 (925) 557-4100 (1-800) 858-1508
Date ________________________
Dear Doctor:
We checked the calibration of your Field Analyzer, serial number ____________, today
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and found that it was reading dB too high / low (select). The
instrument has now been recalibrated.
Please keep this calibration shift in mind when comparing future results against
previous field. If it was reading too high, future tests of stable patients will tend to show
an artifactual loss in threshold sensitivity in the amount shown above. If it was reading
too low, future tests will tend to show an artifactual improvement.
We recommend yearly preventative maintenance and calibration checks for your Field
Analyzer. Inquire about our service contracts, which include a yearly preventative
maintenance visit.
If you have any questions, please contact Carl Zeiss Meditec at 1-877-486-7473 and
ask to have your area's Regional Service Manager give you a call.
Sincerely,
Carl Zeiss Meditec