Optimized lens constants for the ZEISS IOLMaster

Highly accurate IOL power calculation requires optimization of lens constants¹. If the lens power calculation is based on IOLMaster measurements, only lens constants optimized for use with the ZEISS IOLMaster should be applied. Optimized lens constants for the calculation of intraocular lens power with the ZEISS IOLMaster are published by the User Group for Laser Interference Biometry (ULIB) on its website. These constants are based on actual surgical data and are provided by the ULIB as a starting point for individual constant optimizations. Carl Zeiss Meditec AG does not create, validate, verify or otherwise confirm that these third party lens constants are correct or appropriate for IOL implantation.

Importing optimized ULIB lens constants into the ZEISS IOLMaster

Courtesy of ULIB (Dr. Wolfgang Haigis, University Eye Clinic, Wuerzburg, Germany,) Carl Zeiss Meditec AG provides these IOL constants in a downloadable file for importing into the ZEISS IOLMaster using the following media:

  • CD R(W) for IOLMaster version 4.xx
  • USB flash drive for IOLMaster 500 and IOLMaster 700

Importing lens constants into the IOLMaster

Please plug-in the flash drive into the USB port or insert CD-R(W) into your drive. The download file is in .zip or .upt format. Do not unzip this file. Follow the instructions in the ZEISS IOLMaster User Manual to import optimized lens constants from this file.