摘要
目前所有视力表都采用分视角单位设计,由于受这一单位的影响,致使记录视力的方法各不相同。最常见的有小数记录、分数记录及缪氏对数5分记录等。不少学者认为,小数记录与分数记录均存在视力统计较为困难,不能进行视力的定量分析等缺点,而缪氏对数5分记录法虽解决了上述难点,但此法至今仍争论很大。
This paper reported a new millimetric visual test chart and its mode of recording.Thechart,which is based on the principle of size discrimination of the human eye,evaluates visualacuity by the width(in millimetres)rather than the visual angle(in minutes)of a gap of theminimum(optotype discriminated,and records visual acuities directly in millimetres.For ex-ample,if one is able to discriminate a minimum gap of 8 mm width at 5m distance,his visualacuity will be expressed in terms of 5m8.The millimetric visual test chart has the advantageof:a)The results of visual acuities may easily be used for quantitative analysis and statisticalprocessing;b)The millimetric visual acuities may be conveniently converted into fractional vi-sual acuities as well as into decimal visual acuities;c)Visual acuities expressed in millimetresare more understandable and acceptable than those expressed in minutes.
