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Measurement errors
The "Error" message may have two basic causes:
q
The measured values of the internal individual measurements vary by
more than 0.05 mm (very rareor, if instrument was defocused).
q
The measuring marks are either not recognized or recognized only
partly as such. (The measuring marks not recognized will be
identified on the screen after the measurement).
The possible reasons for this are described below:
Maladjustment
Defocused measuring marks
Fig. 55Ą Image with defocused instrument
The images of the measuring marks are too large due to the instrument
being defocused. The system cannot calculate a measured value. The
display field shows "Error".
After correcting the focus adjustment to minimize the peripheral mark
size the measurement can be retaken (old value will be automatically
overwritten). Sometimes, with exactly adjusted focus, small circles (like
haloes) may be visible around the six peripheral measuring points. In this
case, focussing is optimal.
Cause
Solution
Tips for keratometer measurement
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