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Optical Simulation in the Field of Refractive Corneal Surgery

1Guth H., 1Eggert H., 1Hellmann A., 2Scherer K. P., 1Sieber I., 1Stiller P., 1Süß W.,
1Forschungszentrum Karlsruhe GmbH, Institut für Angewandte Informatik (Eggenstein-Leopoldshafen)
2Forschungszentrum Karlsruhe, Institut für Angewandte Informatik (Eggenstein-Leopoldshafen)

Purpose: At the Research Center Karlsruhe within an industrial cooperation a system is under development, which allows to simulate the biomechanical and optical behavior of the human eye after ophthalmologic surgery. Because there exists a close correlation between the biomechanical and the optical properties of the eye, simulation calculations in both fields have to be performed. In the present contribution the optical modeling and simulation part of the system will be described.
Method: The basis of the modeling is the so called Gullstrand Eye including the components "homogeneous cornea", anterior chamber, iris diaphragm, "homogeneous lens nucleus" embedded in the lens shell, vitreous body and retina. The front and the backside surface of the cornea can be described by a spherical, an aspherical, a torical or a polynomial function. While simulating optical imaging, an object built by specifically arranged Lambert sources is reproduced at the retina. A homocentric beam of rays is emitted by every point of the object, propagated through the optical system "eye", forming an image on the retina. For obtaining an objective measure of the individual sharpness this result can be analyzed by digital image processing algorithms. A second method for analyzing the optical properties of the eye provide aberroscopic images, which are produced by simulating special optical paths based on the Tscherning- and the Hartmann-Shack-aberroscope.
Results: Optical simulation calculations have been performed concerning different shapes of the cornea surfaces. The resulting images have been analyzed.
Conclusions: Data yielded by topometrical measurements of a patient's cornea as well as results of biomechanical calculations can be integrated into the optical model for simulating the optical properties of the eye, using the above mentioned methods.