论文部分内容阅读
目的研究近视眼、远视眼少儿角膜前表面的非球面性特征。方法 164例(291眼)经睫状肌麻痹下综合验光仪确定屈光不正度和散光轴向;按等效球镜度分为近视眼组、正视眼组、远视眼组;Humphrey角膜地形图仪检查角膜前表面不同位置曲率值与形状系数(SF)。结果三组SF值近视眼组最低、远视眼组最高,直径7mm处角膜曲率值近视眼较远视眼正视眼都高;角膜形状系数(SF)与球镜度存在有统计学意义的弱正相关 (r=0．16 P=0．003);角膜中央到周边曲率与等效球镜度的回归系数逐渐增加。结论随着近视度数加深,角膜向着周边变平坦的趋势减慢,主要是由于周边直径7mm处变陡速率比中央区快。远视眼角膜向着周边变平坦的趋势加快,可能是由于直径7mm外周边角膜变平坦。
Objective To study the aspheric features of the anterior corneal surface in children with myopia and hyperopia. Methods A total of 164 eyes (291 eyes) underwent ciliary paralysis with a comprehensive optometry instrument to determine the anisometropia and axial astigmatism. The spherical equivalent was divided into myopia group, eyelid group and hyperopia group. Humphrey corneal topography Check the curvature of the corneal surface at different positions and shape factor (SF). Results The SF value in the three groups was the lowest in the myopia group and the highest in the hyperopic group. The corneal curvature value at 7mm in diameter was higher in presbyopia than in presbyopia. There was a statistically significant positive correlation between corneal shape factor (SF) and sphericity (r = 0.16 P = 0.003). The regression coefficient between the central corneal peripheral curvature and the spherical equivalent increased gradually. Conclusions With the deepening of myopia, the cornea tends to flatten toward the periphery, which is mainly due to the steep rate at the periphery diameter of 7mm being faster than that of the central region. Hyperopia cornea toward the periphery to speed up the trend may be due to the outer diameter of 7mm corneal flattening.