调查方法 1.用测度表(系上海市商业机械研究所实验工厂出品)及用验光镜片消减法同时进行,首先对测度表进行了校正,然后由作者一人操作,对每一付眼镜的两个镜片用测度表检查后再用消减法核对,凡有±0.25以上屈光度者列为不合格产品,对于±0.25以下屈光度者列为接近平光产品,不计算在不合格产品之内。 Survey method 1. With the meter (Department of Shanghai Institute of Commercial Machinery experimental plant produced) and the use of optometry lens subtraction method at the same time, the first measure of the table was corrected, and then operated by the author, for each pair of glasses to pay two Lens with a test meter and then check by subtraction method, where ± 0.25 above refraction were classified as unqualified products, for ± 0.25 the following diopters were listed as flat products, not included in the substandard products.