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  Zeiss IOLMaster®
Online Users Instruction Manual V.4
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IOL Power Calculations IOL Power Calculations
Optical Biometry Optical Biometry
Lens Constants Lens Constants
Validation Guidelines
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IOLMaster Manual V.5 Cataract Surgery Arizona
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Anterior Chamber Depth
Optimum Adjustment
Defocused Image
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Phakic Eyes
Dry Eye
Corneal Scars
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IOLMaster — Anterior Chamber Depth
Phakic Eyes.

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.

Phakic Eye

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.

IOL Master warning 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.

IOLMaster Arizona Note: It will suffice if a relatively small section of the lens is visible. The picture below shows an alignment that permits accurate measurement.

Phakic Eye

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).









IOLMaster Help

Zeiss IOLMaster® Tutorial Version 4

Zeiss IOLMaster®

Optical Biometry

Intraocular Lens Power Calculations

East Valley Ophthalmology
5620 East Broadway Road
Mesa, Arizona 85206

Tel: +1-480-981-6111
FAX: +1-480-985-2426

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