论文部分内容阅读
目的用强度矢量法研究小儿静态屈光不正,比较视网膜检影测出的总合散光与角膜曲率计测出的角膜散光的关系。方法分别用视网膜检影与角膜曲率计对152只眼(76人)行静态屈光检查。将屈光不正结果表达成三维直角屈光度坐标上的点。直角屈光度坐标上的每一点坐标(x,y,z)对应于屈光处方的三个分解成分:等效球镜成分、Jackson交叉柱镜J0成分在90°和180°轴位上、和Jackson交叉柱镜J45成分在45°和135°轴位上。结果总合散光的绝对值(TA)与角膜散光的绝对值(CA)呈线形关系。相关系数为0.876,相关系数的统计意义检验(t检验)P值<0.001。直线回归方程为(TA)=0.9759(CA)-0.3743。总合散光交叉柱镜J0成分(RJ0)与角膜散光的交叉柱镜J0成分(CJ0)呈线形关系。相关系数为0.878,相关系数的统计意义检验(t检验)P值<0.001。直线回归方程为RJ0=1.0091CJ0-0.2461。总合散光交叉柱镜J45成分(RJ45)与角膜散光的交叉柱镜J45成分(CJ45)呈线形关系。相关系数为0.570,相关系数的统计意义检验(t检验)P值<0.001。直线回归方程为RJ45=0.559CJ45+0.0024。视网膜检影与角膜曲率计在配对t检验中,总合散光的绝对值[TA]与角膜散光的绝对值的差值均值和标准差为(-0.4290±0.6572,P<0.001),Jackson交叉柱镜J0成分的差值均值和标准差为(-0.2362±0.3318,P<0.001),Jackson交叉柱镜J45成分的差值均值和标准差为(-2.3E-0.3±0.2695,P=0.917)。剩余散光为预测的总合散光与实际的总合散光之差值。61.8%的剩余散光在0.25至0.5D,34.2%的剩余散光在0.5至0.75D,2.6%的剩余散光在0.75至1.0D。结论临床上,角膜曲率计测出的角膜散光可以预测总合散光。95%剩余散光小于0.75D,因此,有一定的实用价值。
Objective To study the static refractive error in children by intensity vector method and compare the total astigmatism detected by retinoscopy with corneal astigmatism. Methods Retinal retinoscopy and keratometer were used to examine 152 eyes (76 subjects) under static refraction. The ametropia result is expressed as a point on a three-dimensional Cartesian diopter. Each point coordinate (x, y, z) on the Cartesian diopter coordinates corresponds to the three components of the refraction prescription: the equivalent spherical component, the Jackson cross-cylinder J0 component at the 90 ° and 180 ° axes, and the Jackson Cross-cylinder J45 components in the 45 ° and 135 ° axial position. Results The absolute value of total astigmatism (TA) was linear with the absolute value of corneal astigmatism (CA). The correlation coefficient was 0.876. The statistical significance of the correlation coefficient test (t test) P <0.001. The linear regression equation is (TA) = 0.9759 (CA) -0.3743. The J0 component (RJ0) of the total astigmatic cross-cylinder and the J0 component (CJ0) of the corneal astigmatic cross-column showed a linear relationship. The correlation coefficient was 0.878, the statistical significance of the correlation coefficient test (t test) P value <0.001. The linear regression equation is RJ0 = 1.0091CJ0-0.2461. The total astigmatism cross-cylinder J45 component (RJ45) and corneal astigmatism cross-cylinder J45 composition (CJ45) showed a linear relationship. The correlation coefficient was 0.570, the statistical significance of the correlation coefficient test (t test) P value <0.001. The linear regression equation is RJ45 = 0.559CJ45 + 0.0024. In the paired t-test, the mean and standard deviation of the absolute value of total astigmatism ([TA]) to that of corneal astigmatism were (-0.4290 ± 0.6572, P <0.001). The Jackson cross-column The mean and standard deviation of the J0 component of the mirror were (-0.2362 ± 0.3318, P <0.001). The mean and standard deviation of the J45 component of the Jackson cross-cylinder were (-2.3E-0.3 ± 0.2695, P = 0.917). The residual astigmatism is the difference between the predicted total astigmatism and the actual total astigmatism. 61.8% of the remaining astigmatism in 0.25 to 0.5D, 34.2% of the remaining astigmatism in the 0.5 to 0.75D, 2.6% of the residual astigmatism in 0.75 to 1.0D. Conclusions Closure of corneal astigmatism can predict total astigmatism clinically. 95% of the remaining astigmatism less than 0.75D, therefore, have some practical value.