The usefulness of eyes is as various as their color. A man may be unable to judge the speed of distant motion, yet be a good inspector of small parts. Most eyes have an aptitude for some special type of vision —distant or near, wide or narrow angled; or for the judgment of space, shape or motion; or for rapid change of focus. Industry stands to profit by selecting eyes for special jobs, adjust jobs to the eyes available.
Measuring these skills has been largely the work of two scientists—Ophthalmologist Hedwig Stieglitz Kuhn*...
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