Zeiss IOLMaster Customer Service: 1-877-486-7473 ext.
IOLMaster — Axial Length Measurement
with Advanced Technology.
The IOLMaster with Advanced Technology features superior
signal processing in axial length measurement mode compared to
the IOLMaster without this technology. In many cases, this enables
an overall evaluation of individual axial length measurements (composite
signal), producing an axial length result without the need for
Evaluation of Axial Length Measurements.
In some cases the axial length can even be determined where this
would not have been previously possible from individual readings.
The IOLMaster displays a single signal of the axial length
measurement in red and marked with an S on the ordinate.
The SNR (signal-noise ratio) is shown on the x-axis.
In contrast, the composite signal is shown in blue and
marked with a C on the ordinate. The increased SNR of the
composite signal is likewise shown on the x-axis.
| The SNR ranges are displayed as a traffic
- Red = Measuring Error
- Yellow = Uncertain or Borderline Value
- Green = Value with Good SNR
Although using Advanced
Technology of the IOLMaster software, axial lengths are measured in the
customary manner, as described in Axial Length Measurement.
Take at least FIVE individual measurements:
The first four measurements are displayed
as usual immediately after the measurement. From the fifth measurement
on, a composite signal is calculated in the background. Afterwhich,
for each individual measurement, the axial length signal is displayed
for about 1 second (red), followed by the display of the composite
In addition, insofar as it could be determined, the axial length
measurement of the composite signal will be displayed below the
horizontal bar in the list of measurements. If no axial length
reading appears after the first five individual measurements,
additional measurements should be taken.
lens opacities, it may be advisable to defocus the device. You
may choose a reflection as large as the circle on the display.
Also try measurements by height variation (turning the joystick)
of the refocused reflection at the lower and/or upper edge of the circle
on the display.
Ensure that the device permits no more than 20 measurements
per eye, per day.
The overall axial length measurement is edited as described in Post-run Editing.