Hayashi K, Hayashi H, Oshika T, Hayashi F
Hayashi Eye Hospital, Fukuoka, Japan.
J Cataract Refract Surg. 2000 Oct;26(10):1510-6. doi: 10.1016/s0886-3350(00)00435-1.
To evaluate irregular astigmatism after silicone, acrylic, and poly(methyl methacrylate) (PMMA) intraocular lens (IOL) implantation using Fourier analysis of videokeratography data.
Two hundred forty eyes having phacoemulsification and IOL implantation were randomly assigned to 1 of 3 groups: 3.5 mm incision and silicone IOL, 4.1 mm incision and acrylic IOL, or 6.5 mm incision and PMMA IOL. All eyes had videokeratographic examinations preoperatively and 2, 4, and 10 days and 1 and 3 months postoperatively. The dioptric data of the central cornea were decomposed into spherical equivalent, regular astigmatism, and irregular astigmatism (decentration and higher-order irregularity) components using Fourier analysis.
Regular astigmatism in the PMMA group was greater than in the silicone and acrylic groups. Decentration in all 3 groups increased significantly postoperatively but virtually returned to preoperative levels by 10 days. No significant difference was observed among the 3 groups. Higher-order irregularity significantly increased after surgery in all 3 groups. The higher-order irregularity in the PMMA group persisted for up to 1 month, while that in the silicone and acrylic groups returned to preoperative levels by 4 days, resulting in significant differences between these groups 10 days and 1 month after IOL implantation.
Irregular astigmatism, both the decentration and higher-order irregularity components, increased significantly after 3 types of scleral tunnel incisions for silicone, acrylic, or PMMA IOL implantation but returned to preoperative levels soon after surgery except for the higher order irregularity after PMMA IOL implantation.
利用角膜地形图数据的傅里叶分析评估硅酮、丙烯酸酯和聚甲基丙烯酸甲酯（PMMA）人工晶状体（IOL）植入术后的不规则散光。
240只接受超声乳化白内障吸除术和IOL植入术的眼睛被随机分为3组中的1组：3.5mm切口并植入硅酮IOL、4.1mm切口并植入丙烯酸酯IOL或6.5mm切口并植入PMMA IOL。所有眼睛在术前以及术后2天、4天、10天、1个月和3个月均接受角膜地形图检查。使用傅里叶分析将中央角膜的屈光数据分解为等效球镜度、规则散光和不规则散光（偏心和高阶不规则度）成分。
PMMA组的规则散光大于硅酮组和丙烯酸酯组。所有3组的偏心在术后均显著增加，但到10天时几乎恢复到术前水平。3组之间未观察到显著差异。所有3组术后高阶不规则度均显著增加。PMMA组的高阶不规则度持续长达1个月，而硅酮组和丙烯酸酯组的高阶不规则度在4天时恢复到术前水平，导致IOL植入后10天和1个月时这些组之间存在显著差异。
在为植入硅酮、丙烯酸酯或PMMA IOL而进行的3种巩膜隧道切口术后，不规则散光（偏心和高阶不规则度成分）均显著增加，但除PMMA IOL植入术后的高阶不规则度外，术后不久即恢复到术前水平。
