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000000Ć1150Ć839 IOLMaster 11.02.2004
Fig. 67 Slit image on the iris (invisible lens)
In such a case, the slit image on the iris is (almost) continuously visible.
The automatic evaluation software does not recognize this kind of
maladjustment. The system will display values that are too short. These
values do
not
correspond to the actual anterior chamber depth, but
represent the distance between the anterior cornea and the iris. Make
sure that the lens section is placed on the front section of the crystalline
lens.
Adjust the instrument laterally until the anterior lens becomes visible. If
necessary, ask the patient to look steadily at the fixation light. Then,
repeat the measurement.
Note:
It will suffice if a relatively small section of the lens is visible. The
picture below shows an alignment which permits accurate meaĆ
surement.
Fig. 68 Minimally visible anterior lens
This image is sufficient for the calculation of the anterior chamber
depth. (In this photo, the front side of the IOLMaster is visible as a
nonĆdisturbing artifact).
Cause
Solution
Tips for
anterior chamber depth measurement
