Keratron
™
Onda Installation and operating manual
OPTIKON 2000
Cod. 161401EN
7-19
2015-03-27
Rev.C
During the measurement the patient must look at the fixation target (Figure 7-31).
In this manner an alignment is created between the axis of the eye to be examined
and the topo-aberrometer axis. The other eye must
not
be closed and, if possible,
should stare at an object that is not lighted much or a wall in the distance. The room
must be dark and the patient adapted to scotopic or mesopic conditions for
maximum dilation of the pupils.
At the end of the
defocus
automatic search, that may require up to 4 steps, if the
[Fogging] button is enabled (yellow), Keratron
™
Onda performs a progressive focus
of the target, both at closer and larger distance, that continues until part of the far
accommodation is released (“Fogging”).
Figure 7-32
: Screen displayed during the “fogging” phase. The chart shows the accommodation response of the
patient. The values in diopters refer to the previously measured or set defocus (ex. -5D).
At the end of each or both “Auto RX” and “Fogging” operations, if the eye has not
moved too much and is still within the "far-near" range, the acquisition starts
automatically. Otherwise, the Keratron
™
Onda displays the message Figure 7-33.
Figure 7-33: Screen displayed at the end of the
defocuscompensation
