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Zeiss IOLMaster Customer Service: 1-877-486-7473 ext.
4030
IOLMaster — Axial Length Measurements
ALM Signal Curves.
Valid Signal Curves
- Very good signals (signal-to-noise ratio > 10)
- Several secondary maxima visible (system specific)
- Clear media, correctly fixating patient
- Slight ametropia
- Clear signal (SNR display GREEN)
- Secondary maxima visible
- Relatively clear media
- Signal in "Borderline SNR" (uncertain) range (SNR display YELLOW)
- Steep rise of measuring signal
- Such readings are marked on the display by an exclamation mark
and the message "Borderline SNR" (uncertain reading)
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Warning
This reading may be used after verification and comparison with other
data from this series of measurements.
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Maladjustments on the Graph
- Low signal (SNR display RED)
- Error message is displayed.
- The measuring signal cannot be clearly distinguished from the
noise.
Possible reasons:
- Unsteady (non fixating) patient
- Strong ametropia
- Dense medial opacity along the visual axis
Repeat the measurement!
Ask the patient to fixate steadily.
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IOLMaster Checklist (pdf)