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Wavefront analysis shows Tecnis reduces spherical aberration
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SAN FRANCISCO — The Tecnis IOL seems to correct the spherical aberration in the eye’s optical system, according to a study using wavefront analysis.
Roberto Bellucci, MD, described a study he performed comparing several types of IOL using the Topcon Wavefront Analyzer, which measures both wavefront characteristics and corneal topography simultaneously. Dr. Bellucci, of Verona, Italy, presented the results of the study here at the American Society of Cataract and Refractive Surgery meeting.
The 25 patients in the study were implanted in equal numbers with one of five types of IOL: the Tecnis, 911 Edge or 812 C from Pharmacia, or the one-piece or three-piece AcrySof from Alcon.
Dr. Bellucci explained that the output of the Topcon device shows both corneal spherical aberration and the total spherical aberration of the eye’s optical system, so it is possible to calculate how much of the aberration is produced by the lens. He said total spherical aberration was reduced by the Tecnis and increased by all the other IOLs studied.
Measured with both a 6-mm and a 4-mm pupil, the total spherical aberration in eyes with the Tecnis was zero, he said. The conclusion of the study was that the Tecnis corrects the spherical aberration present in the human cornea.
Dr. Bellucci acknowledged a financial interest in his subject matter. He was awarded the best paper of session by the moderator and panelists for his presentation.