EyeWorld is the official news magazine of the American Society of Cataract & Refractive Surgery.
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August 2012 EWINTERNATIONAL 55 "It's more common than the 1 in 2,000 figure reported in the litera- ture," he said. Even topography could not help to always properly screen refractive surgery candidates. Hence, Dr. Ambrosio developed an interest in spearheading education about to- mography versus topography, pub- lishing a guest editorial on this subject in the Journal of Refractive Surgery in November 2010. One important distinction, he said, is that topography refers to an- alyzing a place on the surface of the cornea, while tomography could go so far as to create a 3D virtual recon- struction of different parts of the cornea including the thickness and front and back elevation. Dr. Ambrosio then referred to a case presentation from Cornea Day at the 2012 ASCRS·ASOA Symposium & Congress. "This is an example of a case that had ectasia after LASIK in spite of the relatively low risk based on standard screening methods," Dr. Ambrosio said. "Tomography would have detected the risk." Research in practice Dr. Fontes recalls one company in 2006 that promoted an exact meas- ure of corneal strength without doing appropriate research on the topic. "There were some sponsored pa- pers in this area," Dr. Fontes said. "Our papers were the first ones pub- lished in highly respected journals such as Ophthalmology showing [that measure] has some limitations. We studied the topic deeply and people started to take notice." The result was that the com- pany began looking at ways to im- prove its machine and whether it could deliver other information. "I don't think corneal hysteresis has so much value now," Dr. Fontes said. "It's more commercial without much scientific research. " That said, the subject of corneal hysteresis did open a new door for measuring corneal strength that has led to improved measurements, he said. Today, the group continues to generate knowledge about corneal architecture, anatomy in healthy and pathologic corneas, and tries to study in-depth corneal strength and Product #24-6300 Product #24-6100 Call for special combo and introductory pricing. 3222 Phoenixville Pike, Malvern, PA 19355 USA • 800-979-2020 • 610-889-0200 • FAX 610-889-3233 • www.accutome.com its response to deformation. It also continues to study corneal biome- chanics and tomographic indices to improve knowledge in the field. EW Editors' note: Dr. Ambrosio has finan- cial interests with Oculus (Lynnwood, Wash.). Dr. Fontes has no financial interests related to this article. Contact information Ambrosio: dr.renatoambrosio@gmail.com Fontes: brunomfontes@terra.com.br Scanning the Globe... The UBM Plus® and B-Scan Plus® from Accutome Accutome now offers an affordable ultrasound imaging package for the entire eye. The B-Scan Plus and UBM Plus plug directly into a laptop or PC. All images are recorded in a 34 second film loop and easily transferred to EMR. Upgradeable software protects your investment. A full ultrasound imaging system helps to raise the standard of care in your practice. It can help detect, diagnose and measure all segments of the eye including: UBM Plus • Filtration Angle of the Eye • Position of IOLs • Sulcus to Sulcus Measurements • Filtration Angle of the Eye • Position of IOLs • Sulcus to Sulcus Measurements B-Scan Plus • No View In Dense Cataracts • Retinal Detachments • Vitreous Hemorrhaging and PVDs