Reviews Supplements i-Optics : Page 1

C Arthur Cummings, MB, ChB, MMed(Ophth), (Pret), FCS(SA), FRCSEd, is medical director of the Wellington Eye Clinic and consultant ophthal-mologist at the UPMC Beacon Hospital in Dublin, Ireland. He has a specific interest in laser refractive surgery, keratoconus and IOL calculations. Paul M. Karpecki, OD, works in corneal services and heads the clinical research depart-ment at the Koffler Vision Group in Lexington, Ky. Douglas D. Koch, MD, is professor and holds the Allen, Mosbacher, and Law Chair in Ophthalmology at the Cullen Eye Institute, Baylor College of Medicine. His research interests include corneal topography, corneal astig-matism, IOL calculations, and prevention and management of cataract and refractive sur-gical complications. assini : TODAY we are discussing new technologies in the corneal refractive space. Earlier this year, i-Optics released its new corneal shape analyzer, the Cassini. Cassini is based on color LED technology that has submicron accuracy to better measure corneal astigma-tism in both normal and abnor-mal corneas. Its unique imaging technology gives the potential to more accurately measure the axis of astigmatism and better ana-lyze the optics of irregular cor-neas, which could potentially be a game-changer for toric intraocular lens (IOL) planning. —Doug Koch, MD DOUG KOCH, MD: Jon, can you comment on the difference between Cassini and some of the other technologies used to deter-mine the correct axis for toric IOL planning? JONATHAN SOLOMON, MD: Cassini is a corneal shape ana-lyzer that measures a true axis. In my practice, I’ve often times seen that the determin ation of the axis of astigmatism can be a challenge due to the inaccuracy of the various corneal topogra-phers. In my experience, this can certainly lead to reference error True Axis — First Time Right, Always and subsequently to alignment error when implanting a toric IOL. Cassini takes the guesswork out of the equation. The instrument’s technology employs red, green and yellow LEDs that are each positioned in a unique relation-ship to four of its neighbors, which gives each one an unmistakable ‘coordinate.’ Next, the Cassini uses the ray-tracing principle to measure the position of each point to that of its neighbors, using the three different colors as trian-Jonathan Solomon, MD, is director of refractive/cataract surgery at Solomon Eye Physicians & Surgeons with offices in the D.C.-Metro area. Astigmatism axis error margins projected on the eye. Mitchell P. Weikert, MD, MS, is an associate professor at the Cullen Eye Institute, Baylor College of Medicine, where he specializes in corneal, cataract and refrac-tive surgery. He is the resi-dency program director at the Cullen Eye Institute, Baylor College of Medicine and the Medical Director of the Lion’s Eye Bank of Texas. gulation points. A rise in ele-vation increases the distance between points; a dip in eleva-tion decreases it. And because Cassini does not use edge detection in its measurement algorithms, smeared or doubly reflected LEDs cannot skew the results in either direction. Sponsored by: REVIEW OF OPHTHALMOLOGY October 2013

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