The central acuity lies within well-known physiologic limits. When it falls below this, the function itself is damaged, but the conditions met with in practice are not such that the physiologic and earning limitations of the central visual acuity are interdependent; for instance, science calls an individual blind only when perception of light has entirely disappeared, but in actual practice he is blind if the faculty of sight has been weakened to such an extent that the organ of vision can not be used to earn a living. Thus the meaning of blindness as used in daily life is much narrower than that of science.
Now and then extremely great demands may be made upon certain organs which may reach to the highest ability. In actual, practice we are satisfied with the amount of labor which does not strain the powers. There is hardly any vocation which demands the extreme
WÜRDEMANN HV. THE ECONOMIC LIMITATIONS OF THE VISUAL ACUITY IN VARIOUS TRADERS AND PROFESSIONS.. JAMA. 1902;XXXVIII(6):380–382. doi:10.1001/jama.1902.62480060018001e
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