标准对数视力表小数记录的商榷

Discussion on the Decimal Record of Standard Logarithmic Visual Acuity Chart

用标准对数视力表对36名学生进行视力测定,结果表明,在2.5 m(或7.5 m)处所测值换算为5 m视力与5 m所测视力无显著差异(a=0.005),证实了使用标准对数视力表可变距优点。将2.5 m和7.5 m所测视力与5 m视力相比较,发现被测者中有15名完全不同(占41.67%),表明标准对数视力表的小数记录有商榷之处。

Carries on the vision determination through the standard logarithm visual chart to 36 students, the result of that in the 2.5 m （ or 7.5 m） quarter measured the value conversion is the 5 m vision and 5 m measures the vision was not marked difference （ a = 0. 005 ） , Has proven used standard logarithm visual chart invariable distance merit. Compared with 2.5 m and 7.5 m measured that the 5 m vision, have 15 difference in the tests,indicated that the standard logarithm visual chart the decimal record has place of the discussion.