Journal of the Optical Society of America. A, Optics, image science, and vision
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J Opt Soc Am A Opt Image Sci Vis · Jan 2014
Estimating the eye aberration coefficients in resized pupils: is it better to refit or to rescale?
In order to work in a consistent way with Zernike aberration coefficients estimated in different pupils, it is necessary to refer them to a common pupil size. Two standard approaches can be used to that end: to rescale algebraically the coefficients estimated in the original pupil or to refit them anew using the wavefront slope measurements available within the new one. ⋯ In case of enlarging the pupil size, as it can a priori be expected, the opposite holds true. We provide explicit expressions to quantify the errors arising in both cases, including the expected error incurred when extrapolating the Zernike estimation beyond the radius where the measurements were made.