Intraocular Lens Power Calculation Using Pre- and Intra-operative Measurements

Recently a prototype of a combination of an anterior segment OCT (VISANTE; Carl Zeiss Meditec AG) and an operating microscope (OPMI 200; Carl Zeiss Meditec AG) was introduced that allows measurements of the crystalline lens as well as the lens capsule itself after removing the crystalline lens of cataract patients intra-operatively. This device uses OCT technology to create high resolution B-scans (=images) of the anterior segment of the eye. The OCT was shown to be highly reproducible for ACD measurements pre-operatively 12 and small changes of the IOL/crystalline lens can be detected 13. In a previous study (EK-10-125-0710) that was recently published in the journal "Investigative Ophthalmology \& Visual Science" it was shown that intra-operative measurements of the anterior lens capsule improve the refractive outcome theoretically.14 However, in this previous study conventional eye models were used for IOL power calculation and only the intra-operative measurement replaced pre-operative ACD measurements. Aim of this study is to observe, whether the postoperative refractive outcome could be improved theoretically by using both pre- and intra-operative measurements for retrospective IOL power calculation with new eye models.