Visual Resolution and the Diffraction Limit

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Science  30 Jul 1965:
Vol. 149, Issue 3683, pp. 553-555
DOI: 10.1126/science.149.3683.553


Movement of a grating behind a fixed aperture can be detected by human subjects when the grating is well below the diffraction limit of the pupil and below acuity measured with stationary gratings. With movement one sees a flicker or ripple at the edges, and it is argued that these edge effects lead to spurious estimates of optical resolution in insects and man.