Video monitoring of the principal ray of a Maxwellian view for the measurement of optical aberrations, the Stiles-Crawford effect, retinal resolution, and for investigating color vision

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Abstract
A video frame grabbing technique with a computer-generated overlay is used to obtain a direct visualization of the position of the image of a point source, producing a Maxwellian view, in the natural entrance pupil of the human eye. With this simple technique, the image point can be located with an accuracy of at least 0.07 mm. Applications are demonstrated: (a) in instruments using a single Maxwellian view for measuring retinal resolution in white light or superimposed Maxwellian views for color vision experiments, (b) in a dual Maxwellian view apparatus used for measuring the Stiles-Crawford effect of the first kind or for measuring chromatic aberration, and (c) in a new semi-Maxwellian view apparatus for the evaluation of monochromatic and chromatic aberrations.

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