Computer-assisted Toric IOL implantation
From an optical standpoint, toric IOLs are of benefit to patients with astigmatism, but their performance is dependent on proper lens selection and positioning. Surgeons who implant toric IOLs have to consider the concept of “stackable” sources of error.

Compared with a standard monofocal IOL, there are several additional steps—identifying the correct axis of astigmatism, marking the reference axis, marking the steep axis, and aligning the IOL—that must all be done correctly. Although the risk of a mistake is low at each step, small errors can add up and contribute to an undesirable outcome.

Though traditional marking and alignment techniques can work well, I prefer to eliminate as many potential sources of human error as possible. To that end, I have found that switching to a markerless toric alignment system (Callisto Eye, part of the Zeiss Cataract Suite) has eliminated ink marking altogether. This device is an easy transition for users of other elements of the suite (including the IOLMaster and the OPMI Lumera microscopes).

Source : Ophthalmology Times