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Topography Based Calculation of Intraocular Lenses
Wahl J., Preußner P.-R.,
Johannes-Gutenberg-Universität Mainz, Universitäts-Augenklinik (Mainz)
Background: Most of the intraocular lenses are calculated on the base of keratometry using the Littmann apparatus. Eyes that differ from the ideal shape lead to incorrect values particularly after refractive Laser surgery. Because of the oblate shape of the cornea intraocular lenses are calculated too far in the hyperopic range.
Method: The calculation of the intraocular lenses is based on the whole topometry of the cornea. Not only in prolate but also in ablate corneas the correct vertex radii can be determined. This is achieved by numerical approximation of the corneal surface. Moreover the quality of the visual impression by means of optical imaging of Landolts rings upon the retina is checked by consistent ray-tracing and optimised in a second step. The above described method is used in a collective of normal eyes as well as in eyes that have undergone laser treatment.
Results: For normal eyes results obtained by the topometry based method and results obtained by the Littmann method are the same. In the eyes with unusual surfaces investigated so far we do not find any systematic myopic or hyperopic shift.
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