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DIFFRACTION AND VISUAL RESOLUTION

It is known that, when diffraction is the limiting factor of resolution, the resolution of two point sources of light and that of a grating are inversely proportional to the diameter of the aperture. Here it is shown that the same relation is valid for the visual resolution of the Landolt ring test object. A comparison of the resolution, when limited by diffraction, of the Landolt ring and of two point sources of light shows that the resolution of the former is much better. This explains the clinical observation that patients treated with miotics often have better visual acuity than would be expected from the diameters of their pupils.