13900-103 Rev. A Page 29
Rubber Eye Calibration
The rubber eye calibration test sets and/or checks the IOP
measurements of the instrument so that it will provide
readings within the tolerances of the calibrated rubber
eye fixture.
Perform the following:
Note: Before starting this test, ensure that the rubber
eyes are clean and not damaged. Cleaning
instructions were included with the calibrated
eyes. If cleaning instructions are not available,
please contact customer service as indicated in
the Introduction section of this instruction sheet
and one can be sent to you.
1. While in the Services Menu screen, press the button
below the DOWN icon to highlight the Cal./Ver. test,
then press the button below the SELECT icon. The
Calibration Type Menu will be active.
2. Press the button below the DOWN icon to highlight
the Eye test, then press the button below the SELECT
icon. The Tonometer Calibration screen will be
active.
3. Install the set of rubber eyes onto the rubber eye
stand and move the low rubber eye in front of the air-
puff nozzle on the AT550 approximately 0.5 to 1.0
inches (1.3 to 2.5 cm) from the end of the nozzle.
Refer to Figure CT-12.
4. Using the DOWN arrow, highlight the LOW menu
choice. Then press the button below the SELECT
button to activate the menu choice.
Note: If your data sheet does not have a section for the
AT550, your rubber eyes are out of date and will
require recalibration. DO NOT use the values for
the NCTII, Xpert, or the Xpert Plus.
5. Refer to the AT550 section of the data sheet which
was provided with the rubber eyes and set the
Tonometer Calibration number to be the same as the
Rubber Eye Assigned Value. Use the RIGHT arrow to
select the digit which requires modification. Press
the buttons below the +/- icons to increase (+) or
decrease (-) the value.
6. Press the button below the MEASURE icon. The
instrument will take 5 measurements.
Note: The measurements may not match the value
which was entered for that eye. After all
measurements are taken for the three rubber
eyes, the instrument will calculate the correct
internal values after the calculate button is
pressed.
7. Move the Medium Eye in front of the air-puff nozzle.
8. While in the Tonometer Calibration menu screen,
press the DOWN icon button to highlight the Medium
eye then press the SELECT button to modify the
values for the medium eye. Use the +, –, and the
RIGHT buttons to modify the values for the medium
eye. When the number is the same as that which is
on the Calibration Sheet, press the button below the
MEASURE icon. The instrument will take 5 measure-
ments.
9. Move the High Eye in front of the air-puff nozzle.
10. While in the Tonometer Calibration menu screen,
press the DOWN icon button to highlight the High eye
then press the SELECT button to modify the values for
the High eye. Use the +, –, and the RIGHT buttons to
modify the values for the High eye. When the number
is the same as that which is on the Calibration Sheet,
press the button below the MEASURE icon. The
instrument will take 5 measurements.
11. After all measurements are taken, press the button
below the CALCULATE icon. Refer to Figure CT-13.
12. After the instrument has completed the calculations,
press the button below the RETURN icon twice to
return to the Services Menu.
Figure CT-12. Rubber Eye Setup
Figure CT-13. Rubber Eye Calibration Screen
Calibration (Continued)
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