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Institute for Perception TNO, Soesterberg, Netherlands.
Since all subjects demonstrated at least 20/20 near and far acuity, large refractive errors are considered unlikely. Any small remaining refractive errors would not have affected either the correlation values nor the nature of the present results.
The authors are indebted to Dr. Lewis O. Harvey, Jr. and to John T. Fisher, M.D. and Channing Nicholas, M. D. for their advice and assistance.
The combined effect of spherical and chromatic aberrations has been estimated to be only 0.5–0.75 D, which is considerably less than the magnitude of night myopia shown by the majority of the subjects in the present study. Spherical aberration, as well as other effects associated with large pupils, should be exaggerated by pupil dilation; this was not found in Experiment III. The possible contribution of these factors, in addition to those of chromatic aberration and the Purkinje shift, seem to be minimized by the fact that all luminance levels in the present study were photopic.
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