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比较治疗前后视力变化有两种方法,一是采用视力差数的统计方法,一是采用视力倍数的统计方法,对其原理和用法归纳解析如下。方法介绍视力差数统计:最终对数视力减去最初对数视力,以其差值判断疗效,简称差值统计,用L_2—L_1表示,正值表示视力进步,负值表示视力退步,零表示无变化。视力倍数统计:最终小数视力除以最初小数视力,以其比值判断疗效,简称比值统计,用V_2:V_1表示,大于1表示视力进步,小于1表示视力退步,等于1表示无变化。讨论目前我国推广对数视力,但小数视力乃
Comparison of visual acuity before and after treatment there are two ways, one is the use of statistical methods of poor eyesight, one is the use of statistical methods of visual acuity, the principle and usage of induction as follows. Methods introduced vision difference statistics: the final logarithm of visual acuity minus the initial logarithmic visual acuity, with its difference to determine the efficacy, referred to as difference statistics, with L_2-L_1 that positive values indicate visual acuity, negative values show that visual acuity, zero that No change. Visual acuity statistics: the final fractional vision divided by the initial fractional vision, to determine the efficacy of its ratio, referred to as the ratio statistics, with V_2: V_1 said that greater than 1 means visual acuity, less than 1 means visual acuity, equal to 1 means no change. Discussion At present, China promotes logarithmic sight, but decimal visual acuity is