Abstract
The modulation transfer function (MTF) of the frog’s eye was used to calculate retinal intensity distributions of several test patterns. The state of refraction was varied between ––14 D and + 8 D, and the influence of defocussing was studied. Conclusions: (1) The optical resolving power of the eye depends on the type of the stimulus. (2) The criterion that is used (maximum amplitude or half-width) results in different values of resolving power for points and lines. (3) The retinal image of the double line and the double point has a threshold characteristic. Below a certain threshold there is no modulation of the image, and the separation of the maxima of the image is zero. (4) Defocussing in the positive direction (i.e., when the refractive power of the eye and the auxiliary lens is too high) degrades the image more than an equal negative refractive error. (5) The double line is a more suitable stimulus for accommodation than the double point.
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