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目的探讨角膜切削术深度与准分子激光治疗近视疗效的关系。方法ＴｏｍｅｙＳＰ－２０００微型超声测厚仪检测７９例（１５１眼）Ｈａｚｅ＜０．５级的ＰＲＫ术前及术后０．５ａ角膜中央厚度，用术前等值球镜屈光度分别与理论角膜中央切削深度（Ｘ１）、角膜中央实际减少厚度（Ｘ２）和Ｘ１－Ｘ２之绝对值作直线回归分析，并用直线回归分析术后裸眼视力与Ｘ１－Ｘ２之绝对值的相互关系。结果等值球镜屈光度与角膜中央理论切削深度的相关系数ｒ＝０．４４，Ｐ＜０．０１，与角膜中央理论切削深度和角膜中央实际减少厚度变异值ｒ＝０．４０，Ｐ＜０．０１。术后裸眼视力与角膜中央理论切削深度和角膜中央实际减少厚度变异值ｒ＝－０．５１，Ｐ＜０．０１。结论ＰＲＫ角膜中央切削深度越深，治疗屈光度越高；角膜中央厚度的实际减少值越接近理论切削深度，疗效越好；近视度数越高，角膜中央厚度减少值与理论切削深度值间变异越
Objective To investigate the relationship between the depth of corneal cutting and excimer laser treatment of myopia. Methods The central corneal thickness of PRa before and after PRK was measured by TomeySP-2000 micro-thickness gauge in 79 cases (151 eyes) with Haze <0.5 grade. The preoperative spherical equivalent refraction was compared with the theoretical central corneal cutting Depth (X1), the actual reduction of central corneal thickness (X2) and the absolute value of X1-X2 for linear regression analysis and linear regression analysis of the relationship between uncorrected visual acuity and the absolute value of X1-X2. Results The equivalent corneal central corneal refractive depth and the theoretical depth of cut correlation coefficient r = 0.44, P <0.01, and the central corneal cutting depth and the central corneal real reduction in thickness variation r = 0.40, P <0 .01. Postoperative uncorrected visual acuity and central corneal theoretical depth of cut and the central corneal real reduction in thickness variation r = -0.51, P <0.01. Conclusions The deeper central corneal cutting depth is, the higher the refraction is. The closer the actual central corneal thickness reduction is to the theoretical depth of cut, the better the curative effect. The higher the degree of myopia, the lower the central corneal thickness and the theoretical depth of cut variation