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. 2024 Oct 24;15(11):6486–6498. doi: 10.1364/BOE.540051

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Fig. 6. — Left panels: Zones selected for analysis. Top-left: Inner region used for the ellipsoidal fit. Bottom-left: outer region used to analyze the predictive power of the fit. The other four panels represent the four quadrants separately analyzed. Right graph: 3D plot of a refractive map. The blue surface represents the actual 100° measurement while the red surface represents the extrapolation of the ellipsoidal fit in the inner 50°. X and Y axes represent retinal angle in degrees and Z axis represents spherical equivalent in diopters.