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T. Itoga, T. Kiuchi, T. Hiraoka, F. Okamoto, M. Sato, T. Oshika, G. Sugita; Influence of Intraocular Lens Tilt and Decentration on Higher–Order Aberration after Transscleral Suture Fixation . Invest. Ophthalmol. Vis. Sci. 2004;45(13):1754.
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Purpose: Malposition of intraocular lens (IOL) is one of the complications of implant surgery that can deteriorate patient’s quality of vision. The influence of intraocular lens tilt and decentration on the optical quality of pseudophakic eyes, however, has not been studied in detail. In this study, we investigated the correlation between positioning of posterior chamber IOL and ocular higher–order aberrations in patients who underwent transscleral suture fixation surgery. Methods: Subjects were 18 eyes of 18 patients (mean age 63.6 ± 16.2 years) that had undergone transscleral IOL suture fixation at least 6 months ago. The amount of tilt and decentration of the implanted IOL was determined with a Scheimpflug videophotography system (NIDEK EAS–1000). Corneal and total ocular higher–order aberrations were measured with a Hartmann–Shack wavefront analyzer (Topcon KR–9000PW) for a 4–mm pupil. Root–mean–square (RMS) values for Zernike 3rd order (S3, coma–like aberration) and 4th order (S4, spherical–like aberration) aberrations were calculated. Results: Mean tilt angle was 5.57 ± 3.68 degrees and mean decentration length was 0.31 ± 0.2 mm. The amount of tilt showed significant positive correlation with ocular S3 (Pearson r=0.609, p=0.009), but not with corneal S3 (r=0.155, p=0.538). The amount of tilt did not correlate with ocular or corneal S4 (p>0.05). No correlation was found between the degree of IOL decentration and either of aberration parameters. There was no correlation between incision size and ocular or corneal aberrations. Conclusions: Tilting of sutured IOL increases ocular coma–like aberrations.
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