Starting from Datagraph version 5.20 we offer more cataract/IOL related features. If you select 'IOL' as surgery type and Lens Implants' as surgical device a number of specific fields with parameters related to cataract surgery will be shown on the surgery tab. A number of popular lenses can be selected from the 'IOL name' drop down list. By default this will copy IOL constants from the ULIB database (http://www.augenklinik.uni-wuerzburg.de/ulib/), provided for the Zeiss IOL Master 500. You can enter and specify own IOL constants under 'IOL Types and Constants' in the Defaults section.