USER MANUAL (Instruction for Use) SW 6.1
Treatment Selection
Version 6.1.6 dated 2020-01-31 EN Page 152 of 201
does not change its position independently on the offset selection. The offset strategy has an
influence on TAZ display within the eye tracker live screen.
The display of the GREEN COLOURED CIRCLE, GREEN CROSS and RED CROSS follows the eye movements
when eye tracking is active.
The position of the green cross may be different than the position of the RED CROSS during
treatment, even without entering a treatment offset, due to a possible rolling compensation or
because of compensated shifts of pupil center during ablation.
A beam guidance system inside the beam path of the laser steers the excimer beam exactly to
the required ablated position. If the ablation center (marked with a GREEN CROSS) moves too far
(+/- 1.5 mm) away from the center, the system interrupts the treatment.
A message “pupil is not in hot zone” will be displayed on the screen, indicating that the patient
should fixate again, and asks if the eye tracking should be switched off. If the picture of the pupil
is blurred, it is possible that the eye tracker cannot find it.
Figure 8-10: Pupil is not in hot zone
IMPORTANT NOTE
During Eye Tracking initialisation the full pupil and limbus have to be visible
in the eye tracking image. The focus of the excimer laser shall be adjusted and
the patient must fixate. The image should not be influenced by artefacts like
opaque bubble layer or bubbles in anterior chamber after cut in Femto-LASIK,
draping or other surgical instruments.
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