Induced Astigmatism With 2.2-and 3.0-mm Coaxial Phacoemulsification Incisions

被引:94
|
作者
Masket, Samuel [1 ,2 ]
Wang, Li [3 ]
Belani, Shaleen [2 ]
机构
[1] Univ Calif Los Angeles, Jules Stein Eye Inst, Los Angeles, CA 90024 USA
[2] Adv Vis Care, Los Angeles, CA 90067 USA
[3] Baylor Coll Med, Dept Ophthalmol, Houston, TX 77030 USA
关键词
CATARACT-SURGERY;
D O I
10.3928/1081597X-20090101-04
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
PURPOSE: To evaluate the difference between 2.2-mm incision micro-coaxial phacoemulsification and traditional 3.0-mm coaxial phacoemulsification with respect to surgically induced astigmatism after temporally oriented clear corneal incision cataract surgery. METHODS: This prospective, randomized, intra-patient controlled study comprised 22 patients who underwent clear corneal cataract surgery in both eyes. One eye received 2.2-mm incision micro-coaxial phacoemulsification with intraocular lens (IOL) implantation and the fellow eye received traditional 3.0 mm coaxial incision phacoemulsification with IOL implantation. The 2.2-mm incisions were created with a diamond keratome after a 200-mu m groove was constructed in clear cornea at the temporal limbus. The 3.0-mm incisions were created without a pre-cut groove, using a metal keratome. All cases were uncomplicated. Pre- and postoperative keratometric astigmatism at 6 weeks was measured using a hand held Nikon Retinomax K-plus 2 Autorefractor. Three methods were used to analyze the surgically induced astigmatism (SIA) data: 1) algebraic analysis of the magnitude of keratometric astigmatism induced by the surgery, 2) magnitude of SIA by vector analysis, and 3) aggregate analysis of astigmatism using vector analysis. RESULTS: The mean change in the magnitude of keratometric astigmatism was 0.10 +/- 0.08 dopters (D) with the 2.2 mm micro-coaxial incisions and 0.32 +/- 0.20 D with the 3.0-mm traditional incisions (P=.0002). Using vector analysis, the mean magnitude of SIA was 0.35 +/- 0.21 D with the 2.2-mm incisions and 0.67 +/- 0.48 D (P=.006) with the 3.0-mm incisions. CONCLUSIONS: Surgically induced astigmatism with 2.2-nm micro-coaxial incisions and traditional 3.0-mm clear corneal incisions with intra-patient control resulted in statistically and clinically significant reduction in surgically induced astigmatism with the smaller incision size. [J. Refract Surg. 2009;25:21-24.]
引用
收藏
页码:21 / 24
页数:4
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