New Frontiers in IOL Prediction - 16 Pages

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Catalogue excerpts

CRST Cataract & Refractive Surgery Today New Frontiers in IOL Prediction For improved refractive outcomes, trust the Lenstar. Sponsored by HAAG-STREIT DIAGNOSTICS

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Lenstar an Hill-RBF-methodfor excellent refraction outcomes Perfect K values – best toric results For post-refractive cases – quick and reliabl

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New Frontiers in IOL Prediction for Improved Refractive Outcomes Contents IOL Power Selection by Pattern Recognition. . . . . . . . . . . . . . . . . . . . . . . 4 The Hill-RBF method is a new data-driven and self-validating method for IOL power selection. BY WARREN E. HILL, MD Hill-RBF Calculator in Clinical Practice. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 The potential to further enhance refractive outcomes after cataract surgery. BY MICHAEL E. SNYDER, MD Hitting Your Target With Toric IOLs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 High-quality corneal...

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES IOL Power Selection by Pattern Recognition The Hill-RBF method is a new data-driven and self-validating method for IOL power selection. BY WARREN E. HILL, MD In the modern era of cataract surgery, where patient expectations are increasingly high, accurate and reliable IOL power selection is crucial. For many years now, surgeons have relied on incremental improvements to theoretical formulas. And while preoperative planning continues to significantly improve, outcomes have not always been consistent. A fundamental problem with any...

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES Figure 2. Axial length versus anterior chamber depth, one of six pair-wise boundary models for the RBF method. If a preoperative measurement falls outside the blue area, the calculation will be flagged with an out-of-bounds indication. is expanded, improving both the accuracy of pattern recognition and data interpolation. Stated differently, the more cases we have, the smarter the RBF method becomes. This is enormously powerful technology limited only by the amount and the quality of the data used to augment it. SELF-VALIDATION Another...

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES Figure 3. Close-up screen shot of an IOL power calculation with an in-bounds calculation. an email asking for the make, model, and power of the IOL implanted and also the patient’s final refractive outcome. And while the Hill-RBF method was optimized for the Lenstar, it can still be used with other biometers. Ideally, biometers other than the Lenstar should employ high-density keratometry and all axial measurements should be by optical biometry. In the past 5 months, our beta testers have provided more than 10,000 Lenstar cases....

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES Hill-RBF Calculator in Clinical Practice The potential to further enhance refractive outcomes after cataract surgery. BY MICHAEL E. SNYDER, MD Over the past decade, the term refractive cataract surgery has become more commonly used to describe cataract surgery. This terminology, in large part, is due to the accuracy of refractive outcomes that we can now provide our patients after surgery. Although many elements are involved in the practice of refractive cataract surgery, one of the most crucial is the ability to calculate IOL power...

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES Figure 3. An in-bounds calculation with the Hill-RBF calculator. by adding more data (eyes), there still will be points that are above and below the line. A LEAGUE OF ITS OWN The above is not true for the Hill-RBF calculator, which looks at each data point (eye) independently, as it exists relative to outcomes from its fellow data points (eyes). The reason that the Hill-RBF Calculator is so fundamentally different from theoretical IOL power calculation formulas is this: The more eyes that are added to the database, the higher the...

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES Hitting Your Target With Toric IOLs High-quality corneal astigmatism measurements are crucial. BY ADI ABULAFIA, MD The correction of corneal astigmatism with toric IOLs has become a standard of care and a means to improve refractive outcomes after cataract surgery. However, the results are not always predictable: Surgically induced astigmatism, toric IOL misalignment, corneal astigmatism measurements, and the method of calculation have all been described as factors that might contribute to unexpected residual astigmatism. This article...

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES Figure 2. Double-angle plots of errors in predicted residual astigmatism with the Barrett Toric IOL calculator (A) and a standard toric calculator (B) using the Lenstar LS 900 measurements. THE POWER OF REPEATABILITY Good repeatability of corneal astigmatism measurements is essential for high accuracy. In a study conducted on 27 right eyes of healthy volunteers from Ein-Tal Eye Center medical staff,1 we compared the repeatability of two corneal astigmatism measurements taken 1 week apart with two different biometry devices: the Lenstar...

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NEW FRONTIERS IN IOL PREDICTION FOR IMPROVED REFRACTIVE OUTCOMES similar to that of the Barrett toric calculator without adjustments (Figure 3).8 A subsequent study compared the accuracy of direct corneal astigmatism measurements with the Pentacam (Oculus) and a commercial toric calculator to the IOLMaster 500 with the Barrett toric calculator.3 Results in the 99 enrolled eyes showed that the Barrett toric calculator had a lower median absolute and centroid prediction error than direct measurements of the net corneal astigmatic power (Figure 4). These results suggest that using direct measurements...

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LENSTAR LS 900 Improving outcomes Sophisticated IOL Prediction The on-board Hill RBF method, Barrett Universal II and Olsen formula combined with laser precission biometry of the entire eye, including lens thickness, provides the surgeon with premium IOL power prediction results in all kind of eyes. T-Cone Toric Platform True Placido-Topography of the optional T-Cone complements the Lenstar measurement palette. The powerful toric IOL planner, featuring Prof. Barrett’s unique toric calculation methodology, completes this impressive tool. Automated Positioning System APS Taking biometry measurements...

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