Abstract
This manuscript reports on a closed-form solution determining the personalized required shape of a new intraocular lens able to remove spherical aberration and coma of a pseudophakic eye. The proposed analytical method, within the framework of the Seidel theory of third-order optical aberrations, considers corneal conicities, fourth-order aspheric surface of the intraocular optics, pupil-shift effect and ocular kappa angle.
Highlights
Pseudophakia, or pseudophakic eye, corresponds to an eye in which the natural crystalline lens is replaced with an intraocular lens (IOL) after cataract surgery
The IOL design is calculated with a sufficient negative spherical aberration (SA) in order to balance the positive corneal SA and reduce optical aberrations of the whole pseudophakic eye [3,4,5,6,7]
Concerning AcrySof IQ, no aspheric surface specifications of this IOL was found in the literature and the approximation was introduced based on the reference that AcrySof IQ manifested about 74% of spherical aberration of the Tecnis Z9000 (0.74×0.27 = 0.2 mm) [25]
Summary
Pseudophakia, or pseudophakic eye, corresponds to an eye in which the natural crystalline lens is replaced with an intraocular lens (IOL) after cataract surgery. We present an analytical solution determining the required shape for a new aspheric IOL to minimize global on- and off-axis aberrations (SA and coma) of a pseudophakic eye This analytical model (Microsoft Excel sheet available in the supplemental document of this article), that takes into account for the first time to our knowledge, corneal conicities, 4th-order aspheric surface, pupil-shift effect and ocular kappa angle, enables the design of custom IOL for an individual compensation of corneal aberrations. It is in good agreement with results given by Zemax simulation and the performances of the resulting calculated new IOL compare well with those obtained with commercial IOLs. 2. In order to explore the dependence of aberrations on lens shape, the Coddington factor is helpful [23] and we recall that a change in the shape factor X of a lens leads to different changes of the curvatures of its surfaces, as the power of the lens remains unchanged
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