The author has designed and established an apparatus driving a plane mirror by means of various speed drive and a test object viewed appeared to move in any directions and in the relative extensive limit.
Thus, the visual acuity for a moving object was determined and investigated in natural light illumination and results were as follows:
1. The visual acuity when a test object was being displaced in horizontal direction was distinctly less reduced than when being displaced in vertical direction.
2. The test objects used in this experiment were two bar target. Landolt's ring, Ischihara's and Inoue's target. Of these targets, the visual acuity for Ischihara's and Inoue's target was distinctly less reduced than that for the others. While viewing two bar target, the visual acuity was most reduced of all.
3. In illumination from 10 lx to 500 lx, the visual acuity ascended in proportional to intensity of illumination and a linear curve relating the visual acuity and log intensity of illumination was found.
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