Zeiss IOLMaster Customer Service: 1-877-486-7473 ext. 4030

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 IOLMaster. A slight lateral misalignment may make the lens invisible. This problem may also appear with restless or poorly fixating patients.

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 IOLMaster 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 that permits accurate measurement.

The image is sufficient for the calculation of the anterior chamber depth. (In the photo above, the front side of the IOL Master is visible as a non-disturbing artifact).