At long distances, the response is nearer than the stimulus this is illustrated by the icon in the upper left. Such an error is called the lag of accommodation. For most stimulus distances, particularly near ones, the observed response is less than the stimulus (i.e., the eye appears to have focused to a farther distance than the stimulus) this is illustrated by the icon in the lower right of the figure. When the distance to the object producing the image (the accommodative stimulus) is varied, the resulting response follows a pattern like the one in Figure 1A. ![]() In accommodation, the eye’s crystalline lens changes its power to minimize the blur of an image on the retina.
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