Carl Zeiss Meditec IOL Master
Cataract Surgery Arizona

IOLMaster — Servicing and Maintenance.

Care of the IOLMaster

IOLMaster electric IOL Master warning

WARNING: Before cleaning the IOLMaster, switch it off and pull the power supply plug.

When cleaning, the greatest care must be taken to prevent moisture from penetrating the IOLMaster or keyboard, as this may cause damage.

  • All parts of the casing may be wiped off with a moist, but not dripping-wet, cloth. Wipe off any marks or stains with distilled water, to which a drop of household washing up liquid has been added.
  • Never use aggressive or abrasive cleaning agents.
  • Use conventional cleaning cloths for wiping off the display and keyboard of computers and monitors.
  • Contaminated parts with which the patient has come into contact during the examination (chin rest, forehead rest) should be cleaned with a disinfectant approved for the purpose. These parts are resistant to wiping off with low toxic agents (e.g. suds, quaternary ammonium compounds) and intermediate agents (e.g. alcohol, Javel water, iodine; classification pursuant to: Disinfectants and activity spectrum according to the Center for Disease Control and Prevention, Atlanta, USA).
  • Remove dust from optical surfaces by means of a fine brush.
  • If necessary, carefully clean these surfaces with a water-free ether/spirit mixture (9:1) applied with a cotton swab. The swab or lens-cleaning instrument should be moved with a circular motion from the center of the lens to the edge. Ensure that the regulations for inflammable liquids are observed,.
  • When not in use, the IOLMaster should be covered with the dust cover provided to protect it from dust.
  • The packaging material should be kept for future relocation or repair of the IOLMaster, or it may also be returned to the supplier as required.

Restarting After Failure

caution IMPORTANT: Pulling the main plug or cutting off the power while the IOLMaster is running may cause a loss of data and/or defects in the IOLMaster's control software. However, no danger to the patient or user ensues as a result.

If the system fails during operation, take the following steps to restart:

  • Switch on the power supply at the power switch (1, Fig. 9). An automatic test program will run before Windows is launched. Once this has been successfully completed, Windows and the IOLMaster program will be restarted and work can be resumed.

IOLMaster power supply

Test Eye— Verifying Measurement Functions

After switching on, the IOLMaster will prompt a daily calibration check prior to patient measurements. Upon confirming with OK, a check will be performed of measuring functions and work on the device can begin.

The test eyes supplied with the IOLMaster (1, Fig. 77) are for verifying that the IOLMaster is serviceable and properly calibrated.

Measurements can be performed on these test eyes the same as with a human eye. Last, first name and date of birth are mandatory here as well. The supplied scale is to be used for checking the WTW value (an optional function).

IOL Master warning

WARNING: The calibration must be checked every day before starting measurements on a patient. The measured values can be printed out and filed for documentation purposes. If the values obtained from the test eye are not within the given tolerances, no patient measurements may be taken. The IOLMaster must be shut down immediately and secured against inadvertent use. Then notify Carl Zeiss Service.

  • Insert the asymmetrical holder (5) into the holes adjacent to the chin rest - the holding pins for the paper pads (4), may need to be removed beforehand.
  IOLmaster Care and Service

The test eye (1, Fig 77) is secured by a locking screw and mounted on a mandrel which allows it to rotate (7, Fig 77). The respective set value and tolerance (3 and 6, Fig 77) for checking the calibration status are marked on the test eye (1, Fig 77).

In the delivery condition, the Test Eye patient has been entered and named !CHECK DEVICE!, with a birth date of 01/01/1911. Because of the exclamation mark in front of the name, this "patient" will always be at the top of the patient tree in the Patient Manager and can thus be easily found every day for test purposes.

  • Highlight the patient !CHECK DEVICE! and click on New.

Axial Length Measurement (ALM) and Keratometer

The test eye (8, Fig. 77), marked with AL, R, the respective set values and tolerances (6, Fig. 77) is used for checking the axial length measurement (AL) and keratometer (R). The measurements should be taken in the same way as for a human eye.

If the readings (in the case of the keratometer, the radius) are within the tolerances stated on the holder (6, Fig. 77), the IOLMaster is properly calibrated.

Anterior Chamber Depth (ACD) Measurements

The (larger) test eye (2, Fig. 77) on the side of the test eye holder (1, Fig. 77) (marked with the ACD, set value and tolerance) is for checking the anterior chamber depth measuring device. Before starting measurements, the surface structure simulates the cornea and must therefore be clean and grease-free (wipe off with a dry cloth!).

  • The measurements should be taken in the same way as for a human eye. On the video screen verify that the adjustment criteria for an optimum optical section are correct, as for measuring the ACD on the human eye.
  • Here again, if the measured values lie within the given tolerance, the anterior chamber depth measurement is functioning correctly.

Although the side (right or left on the simulated eye) is immaterial for checking the axial length measurement and keratometer (because the optical path for the measurements is rotationally symmetric), when checking the anterior chamber depth measurement it is recommended that the asymmetrical holder (5, Fig. 77) be reversed and the check performed on the other side. When comparing right and left, however, care must be taken to ensure that in both cases the test eye (2, Fig. 77) stands exactly vertically in front of the IOLMaster.


IOLMaster Arizona   Note
The test eyes are ideal for practicing the operation of the IOLMaster.

The status of the Test Eye is also reset each time a new patient (<N> or "new patient" icon) is admitted.


IOL Master warning WARNING: If the test eye readings are not within the given tolerances, the IOLMaster must be shut down. Notify Carl Zeiss Service.

Verifying WTW Measurements (an optional function)

The WTW scale (2, Fig. 78) is for verifying the WTW reading.
  • Take a measurement using the test eye. If the reading is within the tolerances, the WTW determination is properly calibrated.
IOLMaster Arizona   Note
The WTW scale must completely fill the video window. The scale (black lines) must appear in focus.
  IOL Master Test Eye
IOL Master Test Eye software
WTW calibration

Printer Troubleshooting

Use only printers recommended by Carl Zeiss Meditec. The printer models listed on that website have been tested in conjunction with the IOLMaster and, provided the instructions for Setting Up the IOLMaster have been observed, the IOLMaster printer system will operate reliably.

Should printing problems occur, delete all printer drivers not used, as follows:

  • Click on Printer from the Options — Setup pull-down menu.
  • Select the connected printer and designate it as the standard printer (check the appropriate box in the File menu).
  • Open the queue by double-clicking on the standard printer and delete all print jobs in the list by highlighting and pressing the <DEL> key.
  • Select the printers not connected (except New Printer) and press the <DEL> key. Follow the prompts appearing on the screen.
  • Re-close the printer file once the unwanted printer drivers have been removed.

If the printer problem persists, notify Carl Zeiss Service: 877-486-7473

If you connect a printer yourself, it may be connected to either the USB or LPT 1 parallel port. Please note that the printer must be compatible with Windows® XP (driver). To install, see: Setting Up the IOLMaster.

Safety Inspections

To ensure it remains in perfect operating condition, the IOLMaster should undergo an annual safety check (visual inspection, protective conductor resistance and discharge current measurement). The safety checks must be carried out by an authorized Zeiss specialist.

Please observe national safety regulations.