Influence of Optic Decentration and Tilt of an Aspheric Intraocular Lens (Pharmacia Tecnis®) on Higher Order Wavefront Aberrations
Baumeister M., Kasper T., Bühren J., Kohnen T.
Purpose: The foldable silicone intraocular lens Pharmacia Tecnis has got a negative spherical aberration in order to compensate for the positive spherical aberration of the cornea.
Method: Thirteen eyes of 13 cataract patients (4 m, 9 f, mean age 72.3 ± 6.7 years) underwent phacoemulsificaiton and IOL implantation into the capsular bag over a self-sealing posterior limbal tunnel incision. In all cases, a Pharmacia Tecnis aspheric IOL was implanted. One month postoperatively, decentration and tilt of the IOL optic were assessed using Scheimpflug photography (EAS-1000, Nidek). Wavefront aberration was measured using a Hartmann-Shack-Sensor (Zywave, Bausch & Lomb) and correlated to the IOL position.
Results: The median amount of optic tilt was 1.8° (range 0.2°-3.8°), median decentration was 0.2 mm (range 0.1 mm-0.7 mm). The IOL decentration was highly correlated with the RMS value of 3rd order aberrations (correlation coefficient: 0.81).
Conclusions: Decentration of the IOL increases higher order aberrations. This can influence the effect of an aspheric IOL.
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