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Maladjustment
Defocused instrument
Fig. 66 Image with strongly defocused instrument
If the instrument is not optimally focused, the image of the fixation point
becomes larger and fainter. At the same time, the images of the front
edge of the lens and/or the cornea may become so faint that they
cannot be recognized as such. In such a case, the system displays an
"Error" message and an explanatory text indicates which image details
are either missing or could not be recognized correctly.
Improve the focus adjustment of the instrument and repeat the measuĆ
rement. The fixation point must be optimally focused.
Note:
As a rule, slight defocusing of the instrument does not affect the
anterior chamber depth measurement significantly.
Missing lens image with phakic eyes
Particularly in the case of eyes with small pupils it may happen that no
light is reflected back into the viewing optics of the instrument. A slight
lateral misalignment may make the lens invisible. This problem may also
appear with restless or poorly fixating patients.
Cause
Solution
Tips for
anterior chamber depth measurement
Содержание IOLMaster
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