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目的 :分析和探讨准分子激光屈光性角膜术后角膜地形图角膜前表面曲率变化与临床屈光度变化的关系。方法 :对近视度为- 1.5 0～ - 2 4.0 0 D的患者 176例 32 7眼行 PRK或 L ASIK治疗 ,观察 6个月以上。按实矫屈光度分为二组 : 组 - 1.5 0～ - 6 .0 0 D有 12 4眼 ; 组 - 6 .2 5～ - 2 0 .0 0 D有 2 0 3眼 ;并将屈光回退患者 91眼作为 组。经计算机得出角膜曲率变化与临床屈光度变化的散点图及相关系数 r值。结果 :手术前后角膜曲率变化 (X)与临床屈光度变化 (Y)的关系 : 组 Y=1.0 471X+1.0 96 1,r=0 .7841,P<0 .0 0 1; 组 Y=1.334 3X+2 .32 5 6 ,r=0 .75 0 6 ,P<0 .0 0 1; 组 Y=1.6 146 X+0 .6 5 34 ,r=0 .8473,P<0 .0 0 1;32 7眼临床屈光度变化 (X)与临床屈光度变化和角膜曲率变化比值 (Y)的关系 :Y=0 .0 6 2 7X+1.15 34 ,r=0 .6 0 2 9,P<0 .0 0 1;屈光回退患者术后角膜曲率变化值 (X)与屈光回退值 (Y)的关系 :Y=0 .5 0 0 1X+1.86 0 3,r=0 .42 33,P<0 .0 0 5。结论 :无论中、低度近视或高度、超高度近视及屈光回退患者手术前后角膜曲率变化与临床屈光度变化均有高度相关性 ,随着预矫屈光度的增加 ,每单位角膜曲率变化所能矫正的临床屈光度也增加 ,屈光回退患者术后角膜曲率变化值与屈光回退值有中度相?
OBJECTIVE: To analyze and discuss the relationship between corneal topography curvature and clinical refraction after keratomileusis. Methods: A total of 176 patients (32.7 eyes) with myopic degree of - 1.5 0 ~ - 2.0 4.0 0 were treated with PRK or L ASIK for more than 6 months. According to the actual dioptre diopter was divided into two groups: group - 1.5 0 ~ - 6. 0 0D 12 4 eyes; group - 6 .2 5 ~ - 2 0 .0 0 D with 203 eyes; and refractive 91 patients with retreat as a group. The corneal curvature and clinical refraction of the scatter plot and the correlation coefficient r value obtained by computer. Results: The changes of corneal curvature before and after surgery (X) and changes of clinical refraction (Y): group Y = 1.0 471X + 1.0 961, r = 0.7841, P <0.01; group Y = 1.334 3X + 2 .32 5 6, r = 0 .75 0 6, P <0 0 01; group Y = 1.6 146 X + 0 .6 5 34, r = 0 .8473, P <0 .01 1; 32 The relationship between the change of clinical diopter (X) and the change of clinical refraction and corneal curvature (Y) in 7 eyes: Y = 0.6072X + 1.1534, r = 0.6029, P < 1, the value of postoperative corneal curvature (X) and refractive regression (Y) in patients with refractive regression: Y = 0 .5 0 0 1X + 1.86 0 3, r = 0.42 33, P < 0 .0 0 5. CONCLUSION: The changes of corneal curvature before and after surgery are closely related to the changes of clinical refraction in patients with moderate or low myopia or height, ultra-high myopia and refractive regression. With the increase of pre-refraction radiance, the change of corneal curvature per unit Corrected clinical refraction also increased, corneal curvature in patients with refractive regression and refractive regression value of a moderate phase?