常有文献报导,某种方法或药物治疗沙眼非常有效,但经别人复试,则又无效。其原因很多,沙眼症状复杂,诊断无统一标准,疗效评价无统一准则,此外,现用的沙眼分期分类法,对于仔细观察沙眼病情变化,均嫌不足,也是原因之一。作者在实践中摸索出一种数字计算法,长期用于临床,比较准确,介绍如下: Often reported in the literature, a method or medication trachoma is very effective, but after others retest, then invalid. There are many reasons for this. Trachoma symptoms are complicated, there is no uniform standard for diagnosis, and there is no uniform criterion for the evaluation of the curative effect. In addition, the current classification of trachoma staging method is not enough for the careful observation of the change of the trachoma condition, which is also one of the reasons. In practice, the author explored a method of digital calculation, long-term clinical use, more accurate, described as follows: