The minimum number of samples necessary to fully characterize the aberration pattern of the eye is a question under debate in the clinical as well as the scientific community. We performed repeated measurements of ocular aberrations in 12 healthy nonsurgical human eyes and in 3 artificial eyes, using different sampling patterns (hexagonal, circular, and rectangular with 19 to 177 samples, and 3 radial patterns with 49 sample coordinates corresponding to zeros of the Albrecht, Jacobi, and Legendre functions). For each measurement set we computed two different metrics based on the root-mean-square (RMS) of difference maps (RMS_Diff) and the proportional change in the wavefront (W%). These metrics are used to compare wavefront estimates as well as to summarize results across eyes. We used computer simulations to extend our results to "abnormal eyes" (keratoconic, post-LASIK, and post-radial keratotomy eyes). We found that the spatial distribution of the samples can be more important than the number of samples for both our measured as well as our simulated "abnormal" eyes. Experimentally, we did not find large differences across patterns except, as expected, for undersampled patterns.
We investigate the energy spectra of three electrons in SiGe/Si/SiGe
Equilateral triangular and symmetric linear triple quantum dots in the presence
Of magnetic (in either Faraday or Voigt configuration) and electric fields with
Single valley approximation by using the real-space configuration inter...
We propose a
Model to study the shape-induced effects in AFM particles at the AFM resonance
Frequency. The Lagrange function method is used to calculate the spectrum of
Resonance oscillations of the AFM vector in a synthetic multiferroic
(piezoelectric + antiferromagnet). The influence of the specim...
We derive an M_bh-sigma relation between supermassive black hole mass and
Stellar velocity dispersion in galaxy bulges, that results from self-regulated,
Energy-conserving feedback. The relation is of the form M_bh v_w \propto
Sigma^5, where v_w is the velocity of the wind driven by the black hole....
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