Calibration - Zeiss Humphrey matrix User Manual

CALIBRATION

The Humphrey Matrix Visual Field Instrument does not require scheduled calibration. The
instrument calibration is automatically checked each time the instrument is powered ON and at
the start of each test to be sure the unit is properly calibrated. If the instrument detects the need
for calibration, the Operator LCD Display will display a needs calibration warning. If not calibrated
when the needs calibration warning is displayed, the unit will continue to operate normally until
the unit reaches the calibration limits. Once the calibration limits are reached, the unit will not
operate normally until a calibration is completed successfully. Perform calibration at any time,
not only when requested by the instrument. Calibration will take approximately 15 minutes to
complete.
To calibrate the instrument, select the Help (F6) Screen, and then select the Calibration Button.
Before selecting the Calibrate Button in the Calibration Screen (see Figure L), make sure the
Patient Eyepiece is covered with the Calibration Cap. Once the Patient Eyepiece is covered,
select Calibrate. There is a prompt to ensure the Patient Eyepiece is covered. If the Calibration
Cap is not available, substitute something that will temporarily block light from entering the
Patient Eyepiece (black cloth over Patient Visor, etc.) or perform the calibration in a completely
darkened room. The Operator LCD Display will indicate if there is too much ambient light to
complete the calibration. A Calibration Progress indicator is provided.
Figure (L)
Humphrey Matrix Visual Field Instrument 35
Rev. D 08/21/06 PN 701692