Our visual characteristics are affected by various visual environments. In this experiment, we examine how things look in a dense fog. Namely, 4 subjects evaluated their eyesight in a fog of four kinds of particle diameters using colored-landolt ring. Yellow color was given the best eyesight in a dense fog. In other words, under such visual environment, yellow visibility was the best. This tendency was remarkable as the diameter of a fog particle became small.
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