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Evaluation of the meridional longitudinal spherical aberration from corneal topography measurements |
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| Authors: | Gloria Rueda Javier Alda Eusebio Bernabeu |
| Institution: | aOptometry Department, University Complutense of Madrid, School of Optics, Av. Arcos de Jalón, 118. 28037 Madrid, Spain;bApplied Optics Complutense Group, University Complutense of Madrid, School of Optics, Av. Arcos de Jalón, 118. 28037 Madrid, Spain;cApplied Optics Complutense Group, University Complutense of Madrid, Faculty of Physics, Ciudad Universitaria s/n. 28040 Madrid, Spain |
| Abstract: | 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. |
| Keywords: | Corneal profile Videokeratometry Spherical aberration |
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