Holladay J T, Cravy T V, Koch D D
Hermann Eye Center, University of Texas Medical School, Houston 77030.
J Cataract Refract Surg. 1992 Sep;18(5):429-43. doi: 10.1016/s0886-3350(13)80095-8.
Calculating the surgically induced refractive change following ocular surgery is important for evaluating the results of keratore-fractive procedures, smaller incisions and various wound closures for cataract surgery, and the effect of suturing techniques and suture removal following corneal transplant surgery. We present a ten-step method of calculating the spherical- and cylindrical-induced refractive change in a manner suitable for a programmable calculator or personal computer. Several applications are given including (1) adding the overrefraction to the spectacle correction, (2) determining the surgically induced refractive change from the preoperative and postoperative refractions, (3) determining the surgically induced refractive change from the K-readings, (4) rotating axes, (5) determining the power at meridians oblique to the principal meridians of a spherocylinder, (6) determining the coupling ratio, and (7) averaging axes. Standard methods for calculating and reporting aggregate results are also given.
计算眼科手术后手术引起的屈光变化对于评估角膜屈光手术、白内障手术中较小切口和各种伤口闭合的效果以及角膜移植手术后缝合技术和拆线的效果非常重要。我们提出了一种十步法，以适合可编程计算器或个人计算机的方式计算球镜和柱镜引起的屈光变化。给出了几个应用，包括（1）将过矫度数加到眼镜矫正度数上，（2）根据术前和术后验光结果确定手术引起的屈光变化，（3）根据角膜曲率读数确定手术引起的屈光变化，（4）旋转轴，（5）确定与球柱镜主子午线倾斜的子午线的屈光度，（6）确定耦合比，以及（7）平均轴。还给出了计算和报告汇总结果的标准方法。
