Calossi A, Verzella F, Penso A
Centro di Mirochirurgia Oftalmica, Casa di Cura Villalba, Bologna, Italy.
Refract Corneal Surg. 1993 Jul-Aug;9(4):276-82.
After refractive surgery, there may be changes in the spherical and the cylindrical components of the ametropia. In astigmatism, there may be variations in both the power and the axis. The best way to describe change in astigmatism caused by surgery is by vectorial analysis, which indicates the changes in power and the axis. However, in clinical practice, this procedure is limited by the tedious calculations required to establish the oblique cylinder combinations.
We propose a computer program for the calculation, by vectorial analysis, of the refractive changes induced by surgery. The program allows for reference to refractive data or keratometric readings. When the refractive data are considered, it is also possible to obtain the transposition of the correction values from the spectacle plane to that of the cornea. Finally, the program enables the user to calculate the coupling ratio.
Some selected surgical cases are discussed by way of example.
We think that this program will be a simple and accurate means of evaluating the results of refractive and corneal surgery.
屈光手术后，屈光不正的球镜和柱镜成分可能会发生变化。在散光中，度数和轴位都可能出现变化。描述手术引起的散光变化的最佳方法是通过矢量分析，它可以显示度数和轴位的变化。然而，在临床实践中，这个过程受到建立斜圆柱组合所需繁琐计算的限制。
我们提出了一个通过矢量分析计算手术引起的屈光变化的计算机程序。该程序允许参考屈光数据或角膜曲率计读数。当考虑屈光数据时，也可以获得矫正值从眼镜平面到角膜平面的转换。最后，该程序能让用户计算耦合率。
通过举例讨论了一些选定的手术病例。
我们认为这个程序将是评估屈光和角膜手术结果的一种简单而准确的方法。
