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  Zeiss IOLMaster®
Online Users Instruction Manual V.5
printable version
IOL Power Calculations IOL Power Calculations
Optical Biometry Optical Biometry
Lens Constants Lens Constants
Validation Guidelines
Haag Streit LENSTAR® Haag Streit LENSTAR
Zeiss IOLMaster® Zeiss IOLMaster
IOLMaster VIDEO Tutorial
IOLMaster Manual V.5 IOLMaster User Manual V.5
General Operation Cataract Surgery Arizona
IOL Calculation
4-Formula Calculation
IOL Database
After Refractive Surgery
Phakic Lens Implants
IOLMaster Manual V.4 IOLMaster User Manual V.4
IOL Master Manual Download IOLMaster Checklist (pdf)
IOL Master Manual Download IOLMaster Manual V.5.4 (pdf)
IOL Master Manual Download IOLMaster Manual V.5 (pdf)
SIA Calculator
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Zeiss IOLMaster Customer Service: 1-877-486-7473 ext. 4030

IOLMaster — IOL Calculation.


Once all measurements have been taken (depending on the IOL calculation formula), you may use the IOL Master to generate IOL options to match the surgeon's surgical and postoperative requirements. Before the system can calculate IOL options, you must have entered the desired lens types into the database. See: IOL Database.

Start the calculation by clicking on the <I> key or the IOL icon (shown above).

The IOL Calculation window will appear, in which the measured values of both eyes are automatically entered. Depending on the choice of refractive power/radii in the Program Settings submenu, the keratometer readings are displayed in either Corneal K values (D) or Radii (mm).

IOLMaster IOL Power Calculations

  • Click on the appropriate tab to select the desired formula. The Haigis, SRK®II, HofferQ, Holladay, and SRK®/T formulas are implemented as standards.
  • After refractive corneal surgery, the Haigis-L or Prior Refractive Surgery tabs may be selected.
  • Selected phakic lens implants may be calculated with the phakic IOL tab.
  • Select the eye surgeon's name. This gives the surgeon access to lens types saved to his or her database.
  • The measured values may be edited if desired.
IOL Master warning WARNING: Readings appearing with an asterisk (*) in the printout of the lens calculation have been edited and are no longer based on the IOLMaster readings. Using these numbers may result in refractive errors.
  • Select an eye for which the IOL is to be calculated on the screen.
  • Enter the desired target refraction. No entry means 0 D (plano).
  • Select suitable lenses from the lens types shown.
  • After you have entered the necessary data, click on the IOL Calculation button (shown below). This will start IOL calculation of each lens type selected. The calculation will be performed for every measured eye. However, only the data of the selected eye is displayed on the screen.


  • To select the other eye, click on the Surgical Eye radio button OD or OS. The lenses calculated for the other eye will now be displayed.

IOL Master software
Calculated IOL data in IOL calculation window "SRK®/T"

In the columns below each specified lens you will find the calculated refractive powers and target refractions for those lenses. The middle line appearing in bold type indicates which refraction of the corresponding IOL comes closest to the desired target refraction.

IOL Master warning WARNING: The IOL calculation is valid ONLY if the biometric measurement was correct, an appropriate IOL calculation formula was selected, and the IOL constants were optimized for this specific application.


The data calculated for the IOL to be implanted can be printed out:

  • Click on the Print IOL Calculation Data button. The IOL data of both eyes or of one eye and emmetropic IOL will be printed out either on a single page or on separate pages, depending on the option selected in the Program Settings menu.
  • Click on OK to finish IOL calculation.


IOLMaster Help

Zeiss IOLMaster® Tutorial Version 5

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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