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利用动物散光模型评价专门为小动物设计的角膜地形图仪(CK1-VKS)的重复性。在出生后的第5d,为来亨鸡(10只)右眼分别佩戴-5.0D(n=3)、-10.0D(n=3)和-15.0D(n=4)凹透镜。左眼均为处理眼。在出生后的第19d用CK1-VKS为其左,右眼各自测量5次。左眼和右眼在N(读取次数)=4时均比N=3时上下限的范围有所缩窄;左眼在N=5时仍然比N=4时上下限的范围缩窄,但右眼在N=5时比N=4时上下限的范围没有明显的变化。随着读取次数的增多,角膜散光度数前后读数差异越来越小,但无论N为3、4或5均小于临床意义的最小度数(0.25D)。当N为5次时,重复性比较高。右眼负性球镜在诱导近视的同时,也诱导出更多的角膜散光。
The animal astigmatism model was used to evaluate the repeatability of a corneal topographer (CK1-VKS) designed specifically for small animals. On the 5th day after birth, -5.0D (n = 3), -10.0D (n = 3) and -15.0D (n = 4) concave lenses were worn for the right eyes of Laiheng chicken. The left eye is the treatment of the eye. The first 19 days after birth with CK1-VKS for the left and right eyes were measured 5 times each. Left eye and right eye narrowed the range of upper and lower limits when N (number of readings) = 4 compared with N = 3. Left eye narrowed the range of upper and lower limits when N = 5, However, there is no significant change in the upper and lower limits of the right eye when N = 5 compared to N = 4. As the number of readings increased, the difference in readings before and after corneal astigmatism became smaller and smaller. However, no matter whether N was 3, 4 or 5 were less than the minimum clinical significance (0.25D). Repeatability is high when N is 5 times. Negative spherical negative lens in the induction of myopia, but also induced more corneal astigmatism.