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Jin Kwon Chung, Mee Kum Kim, Won Ryang Wee; Comparative Analysis of Residual Astigmatism Induced by a Single-piece or Three-piece Intraocular Lens after Cataract Surgery. Invest. Ophthalmol. Vis. Sci. 2013;54(15):849.
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To analyze comparatively lenticular astigmatism of single- and three-piece intraocular lenses (IOLs) after cataract surgery.
The medical records of the 397 patients who underwent cataract surgery with IOL implantation were retrospectively reviewed. Patients were divided into 4 groups depending on the implanted IOLs (SN60WF, SN60AT, MA60BM, or AR40e). IOL induced lenticular astigmatism was measured by differences between refractive astigmatism and total corneal astigmatism as determined by Fourier transformation. Vertical and horizontal astigmatic vectors (J0), oblique astigmatic vectors (J45), and overall IOL induced astigmatic strengths were compared. Coefficients of determination of IOL J0 and J45 values were assessed using linear regression models.
Mean (J0, J45) vectors were -0.19 diopters (D) and 0.06 D, -0.20 D and 0.06 D, -0.17 D and 0.09D, and -0.22D and 0.06 D in the SN60WF, SN60AT, MA60BM, and AR40e groups, respectively. No significant intergroup differences were found for J0 or J45. Overall IOL induced astigmatic strengths were 0.35 D, 0.37 D, 0.42 D, and 0.39 D in the SN60WF, SN60AT, MA60BM, and AR40e groups, respectively, which were without statistical significance. Linear regression analysis showed a highest R2 value for SN60AT and a lowest R2 value for AR40e for the determination of refractive astigmatism. The residual astigmatism induced by IOLs contributed to refractive astigmatism by an average of 23.8%.
Single-piece IOLs with an aspheric optic seemed to be comparable in terms of functional stability with three-piece IOLs in terms of inducible residual astigmatism.
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