Surgically induced astigmatism after posterior chamber phakic intraocular lens implantation.

作者:	K Kamiya, K Shimizu, D Aizawa, A Igarashi, M Komatsu
语言:	Eng.
日期:	2009-11-26
学报:	The British journal of ophthalmology (1468-2079)
发行:	Br J Ophthalmol. 2009 Dec;93(12):1648-51
摘要:	AIM: To assess astigmatism induced after phakic intraocular lens (Visian ICL, STAAR Surgical) implantation. METHODS: Seventy-three eyes of 47 patients undergoing ICL implantation through a horizontal 3.0 mm clear corneal incision were retrospectively examined. The amount of corneal astigmatism before and 3 months after surgery using an automated keratometer (ARK-700A, Nidek) and corneal topography (ATRAS995, Carl Zeiss Meditec) were quantitatively investigated. The surgically induced astigmatism was assessed by vector analysis using the Holladay-Cravy-Koch formula. RESULTS: The corneal astigmatism was significantly increased from 1.10 (0.51) dioptres (D) to 1.44 (0.57) D using the keratometer (Wilcoxon signed-rank test, p<0.001). It was also significantly increased from 1.16 (0.53) D to 1.45 (0.57) D using corneal topography (p<0.001). On the other hand, the manifest astigmatism was significantly decreased from 0.93 (0.60) D to 0.72 (0.58) D (p<0.001). The surgically induced astigmatism was 0.45 (0.26) D at an axis of 93.3 degrees using the keratometer and 0.49 (0.26) D at an axis of 98.0 degrees using corneal topography. CONCLUSIONS: ICL implantation induces corneal astigmatism through a with-the-rule astigmatic shift of approximately 0.5 D, which was small but not negligible for candidates for refractive surgery.
版权:	The British journal of ophthalmology Department of Ophthalmology, University of Kitasato School of Medicine, 1-15-1 Kitasato, Sagamihara, Kanagawa 228-8555, Japan. kamiyak-tky umin.ac.jp
全文:	DOI - The British journal of ophthalmology (DOI) EBSCO - HTML (需要捐款) HighWire Press - HTML (需要捐款) Ovid Technologies, Inc. - HTML (需要捐款)
科目:	Adolescent, Adult, Astigmatism, Corneal Topography, Female, Humans, Lens Implantation, Intraocular, Male, Middle Aged, Myopia, Retrospective Studies, Young Adult