Programm                 "Degeneration und Regeneration– Grundlagen, Diagnostik und Therapie"

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Simulation of the Refractive Behaviour of a Virtual Eye

Guth H., Hellmann A., Quinte A., Scherer K. P., Stiller P., Süß W.
Institute for Practical Informatics, Research Centre Karlsruhe GmbH, Karlsruhe

Purpose: In the context of an industrial co-operation a system is developed, which allows to predict the post operative patient-specific behaviour of the human eye before surgical interventions on the basis of coupled biomechanical and optical simulations. In this contribution the possibilities of the optical modelling and simulation are to be demonstrated.
Method: One possibility to analyze the attributes of a virtual eye offers the optical imaging of a pattern onto the retina. The quality of this image can be judged by the examination of the image acuity. By variation of the sample distance within a series of simulations the progression of sharpness gets analyzed and so the parameter of maximum sharpness can be found. So the change of dioptres reached by means of a refractive surgery can be determined by a comparison of the positions of the sharpness maxima before and after the interference. Further possibilities offer aberroscopic procedures, which calculate the propagation of special rays. An analysis of the corresponding wave fronts permits conclusions on the optical quality of the eye. These methods also allow determining the parameters used by refractive surgery in order to change the cornea geometry. In all cases the Gullstrand model of the human eye serves as base for the optical modelling and simulation, whereas all refractive surfaces can be described by polynomi

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