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从1990年5月1日起,我国将使用《标准对数视力表》,同时废止目前国内现行的《国际标准视力表》,这是我国标准化工作的重大成果。《标准对数视力表》除了具有三划等长正方形“E”字视标、均匀的几何级数增率((10)~(1/(10))≈1.2589)、缪氏5分记录法、低视力能以数值表达以及视力统计方便等优、特点外,能够灵活地变距应用则是它的另一特点。正确熟练地掌握好变距应用,不仅能扩大该表的视力检测范围,而且可以防止或鉴别伪视。在变距应用时,使用者常常需要先查变距校正表或用公式计算出校正值(e)(e=log
From May 1, 1990 onwards, China will use the “standard logarithmic visual acuity chart”, while abolishing the current domestic “international standard visual acuity chart”, which is China’s major achievements in standardization. “Standard logarithmic visual acuity chart” in addition to having three equal-length square “E” word standard, uniform geometric progression rate ((10) ~ (1 / (10)) ≈1.2589) , Low vision can be expressed in terms of numerical and visual statistical convenience and other advantages, features, the flexibility to change the application is another feature of it. Accurately master the application of variable pitch, not only can expand the scope of vision test, but also can prevent or identify the fake. In variable pitch applications, the user often needs to check the calibration table or calculate the calibration value (e) (e = log