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000000Ć1150Ć839 IOLMaster 11.02.2004
Determination of "WhiteĆToĆWhite"
[WTW]
(optional)
Activate the WTW mode as follows:
<space>
(only when in ACD mode) or
Icon or
<W>
key.
Let the patient look at the yellow fixation light!
Align the instrument so that the six peripheral measuring points are
symmetrical with the crosshair and the iris structures or the edge of the
pupil appears optimally focused.
Note:
Ask the patient, if she or he sees the fixation point. If the patient
fails to fixate properly, the visual axis is not detected correctly,
which may result in measurement errors.
Start the measurement using pushbutton on the joystick.
Fig. 22 WTW Determination
The iris is imaged and its center determined. The WTW result presents
the diameter of the circle segments visible on the screen as lying around
the iris.
The image is evaluated by locating and determining the transition from
the conjunctiva (white) to the cornea (colored iris).
Key
Button
space
W
Operation
