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T. Yamaguchi, A. Yasuda, J. Koshimizu; Refractive Results of Cataract Surgery After Phototherapeutic Keratectomy (Ptk). Invest. Ophthalmol. Vis. Sci. 2008;49(13):2932.
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To evaluate refractive results of cataract surgery after phototherapeutic keratectomy (PTK) for several pathological corneas.
Twenty nine eyes of 22 patients including 7eyes of 5 males and 22 eyes of 17 females who underwent cataract surgery after PTK were analyzed. Fourteen eyes of 11 cases of Avellino corneal dystrophy (ACD), 11 eyes of 8 cases of band-shaped keratopathy (BSK) and 4 eyes of 3 cases of corneal scar (CS) were included. PTK was performed with the VISX eximer laser system. The depth of ablation depended on the depth of opacity. Period between PTK and cataract surgery was 27 months in average (2 to 114 months). Cataract surgery was performed with phacoemulsification (PEA) or extracapsular cataract extraction (ECCE) followed by implantation of intraocular lens (IOL). IOL power was calculated using the SRK-IIformula. Final postoperative refractive error from target refraction was analyzed in spherical equivalent. Follow-up period after cataract surgery was 38 months in average (5 to 129 months).
Postoperative refractive error was -0.71±2.31D in all eyes, +0.14±1.74D in cases with PEA and -2.10 ±2.52D with ECCE. In ACD, the error was -0.24 ±1.77D with both procedures, +0.13±1.64D with PEA and -1.15±1.98D with ECCE; -1.30D±2.31D, -0.12±1.96D and -3.35±1.15D respectively in BSK; -0.76±4.00D, +2.0D (1 eye), -1.69±4.33D respectively in CS.
Using SRK-II formula, cataract surgery led myopic error in average in cases who had been performed PTK for ACD, BSK or CS. PEA may result less refractive error than ECCE, however values were unpredictable.
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