For example, when it is a thin lens, the distance between the two focal points and the center of the lens is approximately equal. The focal length of a convex lens is the distance from the focal point to the center of the lens. The smaller the spherical radius of the co...
patient with insertion of spherical and cylindrical lenses (Vs,Vz) in front of the eye, to provide different focal distance values (D) for the test image, which are plotted alongside the sum diopter values for the lenses, to provide a curve allowing selection of the optimum lens combination....
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To compare the outcomes of a toric phakic intraocular lens (PIOL) and a spherical PIOL combined with astigmatic keratotomy (AK) for the correction of high myopic astigmatism. This study enrolled patients with high myopic astigmatism, including 30 eyes (2
Notwithstanding the difference in dimensionality between the simulations and experiments (2D cylindrical vs. 3D spherical), the clearest source of the model deviating from the radiographic results is the lack of a strength model in the simulations. If the effects of strength were to abruptly ...
(0.317 ± 0.215 vs 0.338 ± 0.148 μm,P = 0.043; and 0.281 ± 0.207 vs 0.314 ± 0.153 μm,P < 0.001). The incidence of eyes with negative total corneal primary spherical aberration increased as axial length increased in the high myopia group, and the...
Correction of Astigmatism requires the addition of some kind of cylindrical power to a standard correction. The added cylinder will have both a magnitude and an axis. This alone greatly multiplies the number of correction prescriptions offered. Spectacle lens correction has been most successful at ...
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