Rueda Ordax, Gloria MaríaAlda, JavierBernabeu Martínez, Eusebio2023-06-202023-06-2020100030-402610.1016/j.ijleo.2009.09.011https://hdl.handle.net/20.500.14352/44291© 2010 Elsevier GmbH. We are deeply grateful to Dr. Eduard A. Phillipe, of EyeSys Laboratories Inc. for allowing us to use the ‘‘cornsag’’ utility. We also appreciate very much the collaboration of the Ophthalmology Department of the University Complutense of Madrid for facil- itating the use of the videokeratometer.This paper shows how corneal topographic data can be used to determine the value of the longitudinal spherical aberration. We have obtained the corneal profiles and the values of the longitudinal spherical aberration for the rays propagating within the steepest and flattest meridional planes, by using a real raytracing algorithm. These corneal profiles have been also fitted to conicoids and the asphericity parameter has been calculated. We have found that the longitudinal spherical aberration follows a parabolic dependence for a circular region of 5 mm in diameter. This parabolic dependence has been fitted with a polynomial function. The data provided by commercial topographic systems can be used to obtain the longitudinal spherical aberration along the selected meridians.engjournal articlehttp://dx.doi.org/10.1016/j.ijleo.2009.09.011http://www.sciencedirect.comopen access535Optical AberrationsContact-LensesEyeVideokeratographyÓptica (Física)2209.19 Óptica Física