Fig. 9 Device Adjustment To Reach Optimum Measurement Position - Zeiss IOLMaster 500 Manual

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Fig. 9 Device adjustment to reach optimum measurement position
It is recommended that the patient blink shortly before the measurement to
produce a continuous tear film. This will improve the reflectivity of the
cornea. Make sure the patient's eyelids are outside the lid aperture edges of
the eye template (3, Fig. 9). Press the joystick button to release a series of
images to be captured in Reference Image mode. Subsequent to this
measurement, the device automatically switches into Keratometry mode and
starts a keratometer measurement.
CAUTION – RISK OF OPERATING ERRORS
If the patient fails to fixate properly, the visual axis will not be correctly
recognized, which may result in measuring errors. Measurements should
never be performed through contact lenses, as this produces incorrect
results.
After automatically switching from Reference Image mode to Keratometry
mode, the optimum measurement position for keratometer measurement
should already have been reached (green traffic light). Regardless of the
configuration settings (automatic or manual measurement), the
measurement will start automatically. In some cases minor corrections of the
optimum measurement position may be necessary. Arrows will show how
the joystick must be moved in order to reach the optimum measurement
position. Regardless of the configuration settings (automatic or manual
measurement), the measurement will start automatically.

Ensure that all six peripheral points are visible and located in the
field between the two auxiliary circles on the display. It is
recommended that the patient blink his/her eye shortly before the
measurement to produce a continuous tear film. This will improve
the reflectivity of the cornea. The measuring points should be
circular or ellipsoid. If the measuring points are irregular (e.g. with
a corneal scar), measurement is not possible. Precise measurements
are possible only if the six peripheral measuring points appear
optimally focused on the display.
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Operation of the instrument
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000000-1865-713-GA-en-US-080622
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