![]() ![]() Lags of 1 diopter (D) or more have often been reported even for distances that are still within the range of distances to which the eye can change its state (i.e., distances farther than the near point and nearer than the far point). ![]() This is the lead of accommodation ( Morgan & Olmsted, 1939 Morgan, 1944, 1968 Heath, 1956 Fincham & Walton, 1957 Charman, 1999 Plainis et al., 2005). 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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