Leen M M, Ho C C, Yanoff M
Department of Ophthalmology, Hahnemann University Hospital, Philadelphia, Pa.
Ophthalmic Surg. 1993 Sep;24(9):586-92.
One hundred sixteen eyes with cataracts were prospectively randomized into four surgical groups. Silicone and polymethylmethacrylate (PMMA) intraocular lenses were implanted into the posterior chamber of these eyes through 4-, 6-, or 11-millimeter incisions by one surgeon. Surgically-induced astigmatism was evaluated in terms of: (1) the proportion of eyes achieving a refractive cylinder of 1.5 or less, without regard to axis; and (2) the induced cylinder, with regard to axis, using vector analysis. One week postoperatively, the eyes with a 4-millimeter incision had a significantly lower mean induced cylinder than those with larger incisions (P = .019); and all three phacoemulsification groups had a significantly higher proportion of eyes with a cylinder of 1.5 or less than the nuclear expression group (P < .01). One month postoperatively, the 4-millimeter-incision group had a significantly lower mean induced cylinder (P = .044) as well as a significantly higher proportion of eyes with a cylinder of 1.5 or less, than the larger-incision groups (P = .05). Three months postoperatively, no value of any parameter in any group differed significantly from that of that parameter in any other group.
116只患有白内障的眼睛被前瞻性地随机分为四个手术组。由一名外科医生通过4毫米、6毫米或11毫米的切口，将硅胶和聚甲基丙烯酸甲酯（PMMA）人工晶状体植入这些眼睛的后房。手术引起的散光通过以下方式进行评估：（1）不考虑轴位，屈光柱镜达到1.5或更低的眼睛比例；（2）使用矢量分析，考虑轴位的诱导柱镜。术后一周，4毫米切口的眼睛平均诱导柱镜明显低于切口较大的眼睛（P = 0.019）；所有三个超声乳化组中柱镜为1.5或更低的眼睛比例明显高于核表达组（P < 0.01）。术后一个月，4毫米切口组的平均诱导柱镜明显更低（P = 0.044），并且柱镜为1.5或更低的眼睛比例明显高于切口较大的组（P = 0.05）。术后三个月，任何组中任何参数的值与其他任何组中该参数的值均无显著差异。
