Eyeworld

EW CATARACT 33 September 2014 determines sphere and cylinder powers, and provides output for all IOLs by all manufacturers after a single entry of the biometric data. The calculator's offi cial release will coincide with the 2014 American Academy of Ophthalmology meet- ing in Chicago, Dr. Sayegh said. "We have verifi ed the agreement of the calculator with existing calculators in the majority of cases and its supe- riority in extreme cases." Clinical implications Optimizing axial length in long eyes before using standard IOL formulas can greatly reduce postoperative hyperopic surprises. This is a simple and free technique that can be incorporated into every clinician's practice today to improve outcomes. As premium IOLs for astigmatism and presbyopia continue to gain popularity, innovative approaches to optimize lens selection will continue to emerge. EW Reference Wang L, Shirayama M, Ma XJ, Kohnen T, Koch DD. Optimizing intraocular lens power calculations in eyes with axial lengths above 25.0 mm. J Cataract Refract Surg. 2011 Nov;37(11):2018–27. Editors' note: The physicians have no fi nancial interests related to their comments. Contact information Barrett: ryanbarrett11@gmail.com Ong: honshing@gmail.com Hartwig: andreas.hartwig@fi rma-hartwig.de Sayegh: sayegh@umich.edu age that affect surgically induced astigmatism?" Dr. Hartwig conducted a retro- spective study of more than 5,000 eyes to evaluate the effect of age on deviation from predicted postopera- tive refraction (PPOR). Patients were divided into 3 groups by age: <65 years old, 65–80 years old, or >80 years old. Overall, the mean deviation from PPOR for the entire cohort was –0.06±0.78 diopters. "There was a signifi cant dif- ference in postoperative refractive outcome between the age groups," he said. "This might need to be consid- ered when planning cataract surgery in older patients," he concluded. Torics Selecting the right power toric IOL can be time consuming. The current approach is to select spherical IOL power fi rst, then enter the biometric data into one of many manufactur- er's online calculators to get a toric value, explained Samir Sayegh, MD, PhD, FACS, medical director of the Eye Center, Champaign, Ill. "Average values are no longer adequate for the use of toric IOLs," he said, "and as biometric values increase, so does the magnitude of the error of some of the calculators available from the manufacturers." The current process is too com- plicated, he said. "It takes me more time to calculate the IOL power than to perform the surgery." He has developed a universal calculator that simultaneously T. 800.461.1200 | www.innovativexcimer.com Improved Clinical Outcomes of CXL and PRK with Amoils Epithelial Scrubber and PRK with Amoils Epithelial Scrubber Epithelial Removal Has Never Been Easier Corneal Xlinking, PRK & Advanced Surface Ablation • Uniform epithelium removal in only 5 - 7 seconds • Avoid alcohol damage to surrounding tissue • Minimize total procedure time • No need for subsequent scraping VISIT US AT THE AAO BOOTH 2013 Axial length optimization strategies for common IOL calculation formulas Formula Optimized axial length (AL) Holladay 1 =(0.8814 x IOLMaster AL) + 2.8701 Haigis =(0.9621 x IOLMaster AL) + 0.6763 SRK/T =(0.8981 x IOLMaster AL) + 2.5637

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