On the Generation of Spherical Aberration and Coma of Variable Magnitude

With so much interest being shown on the monochromatic aberrations of the eye, it is perhaps remarkable that few have studied their effect on vision. Besides spherical aberration and astigmatism there are not many studies on the influence of the third and four order wave aberration in vision. Part of the reason for this must lie in the difficulty of first measuring the high order aberrations of the eye and, secondly, introducing monochromatic aberrations of known quantity into a system incorporating the human eye as a sensor.