USER MANUAL (Instruction for Use) SW 6.1
Treatment Selection
Version 6.1.6 dated 2020-01-31 EN Page 151 of 201
Figure 8-9: Arrangement of the coordinate system for the eye tracker
CAUTION
The arrangement of the coordinate system is displayed in Figure 8-9. Positive
values along the x-axis point to the right side of the patient and positive values
along the y-axis point in the direction of the patients head.
The eye tracker calculates the center of the pupil from the live picture. This point of reference is
represented on the screen with a RED CROSS. The red crosshair indicates the deviation of the pupil
center from the center of the beam path by changing the length of its axis.
In case of the asymmetric offset, a GREEN CROSS represents the deviation from pupil centre
including offsets from Rolling and PCSC (Pupil Center Shift Compensation). The Total Ablation
Zone (TAZ) is displayed dynamically as a GREEN COLOURED CIRCLE following the position of the
ablation center (not displayed) which is equal to the pupil centre (RED CROSS).
In case of the symmetric offset, a GREEN CROSS represents the deviation from pupil centre
including offsets from Rolling and PCSC (Pupil Center Shift Compensation). Here, shift of the
GREEN CROSS due to a possibly symmetric offset is excluded in this display. The Total Ablation
Zone (TAZ) is displayed dynamically as a GREEN COLOURED CIRCLE following the position of the
ablation center (not displayed) with regard to the pupil centre (RED CROSS) and the symmetric
offset magnitude of the SCHWIND CAM treatment plan.
Note: In both symmetric and asymmetric offsets the pupil center without Rolling and PCSC is
visualized by the RED CROSS. The GREEN CROSS always denotes the pupil center including offsets
from Rolling and PCSC whether the asymmetric or the symmetric offset strategy is selected and
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