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对数视力表,在我国自1966年发表,经历了24年的历史,终于在我国于1990年5月1日起实施。从生理学和生物物理学角度,对此作一简要复习,也许不无裨益。 一、Weber方程的建立和Fechner的修改。 在日常生活中,人们已经观察到一个屡见不鲜的生理现象,就是当感觉器官受到的刺激强度加大时,感觉强度也会增强。德国解剖学家和生理学家Weber用在皮肤上加小砝码的方法,能使受试者感觉出重量的改变。
Logarithmic visual acuity chart, published in our country since 1966, has experienced 24 years of history, and finally in our country in May 1, 1990 come into operation. From a physiology and biophysical point of view, a brief review of this, may not be without benefits. First, the establishment of Weber equation and Fechner’s modification. In daily life, people have observed a common physiological phenomenon, that is, when the sensory organ is stimulated to increase intensity, the feeling intensity will also be enhanced. German anatomist and physiologist Weber’s method of applying small weights to the skin can make subjects feel weight changes.