3-12
In case the measurement cannot be repeated the set times for
some reason, “KRT ?” will be displayed. In this case, mea-
surement can be done again automatically by pressing AUTO
button ( or manually by pressing the measurement switch '.
<Countermeasures for difficult measurement>
In the event measurement can not be made or the error mes-
sage is displayed for any measurement results, such measure-
ment inconveniences are assumed to be mainly caused by the
following reasons. If so, the following countermeasures shall
be given for solution.
y Blinking or nystagmus
Advise the Patient to look at the fixation target with his
eye to be examined and again start measurement. If Auto
Shot does not work due to nystagmus with severe eye
movement, press the Measurement Switch ' in good tim-
ing with the Target light Spot ( as being viewed, so
measurement is thereat taken (by manually measurement).
If, however, correct positioning is not been made, mea-
surement deviations will possibly be caused. Such manu-
ally measurement should be used only when you have to
give measurement even in an unstable condition.
y Interfering the minimum pupil diameter ring with the eye-
lid or the eyelash
Have the Patient open his eye widely until measurement
ends, or again take measurement by lightly lifting the
Patient's upper eyelid with the examiner's finger.
y Reflected light in the IOL surface
When measuring an IOL implanted eye, correct measure-
ment cannot sometimes be taken due to the reflection in
the IOL surface.
y External light as luminous light is projected to the eye to
be examined
Adjust the patient's eye to be examined so it is not sub-
jected to an external light and again take measurement.
y An abnormal condition with the eye with corneal disease
in the corneal surface
Carry out manual measurement, provided that, if the eye
suffers from a serious disease, even manual measurement
may show an erroneous measurement.
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(Fig. 4)
(Fig. 5)
3.3 MEASUREMENT
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(Fig. 3)
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