Algorithms for the application of Hartmann-Shack wavefront sensors in ophthalmology
The topic of this thesis is the development of procedures and algorithms for applications of Hartmann-Shack wavefront sensors in ophthalmology. Two compact systems were built to do measurements of the entire optical system of the human eye. Automatic pre-correction modules were integrated to compensate a sphere of -11.25 dpt to 3.25 dpt and an astigmatism of up to 4 dpt. In the field of image processing, procedures were developed, which allow to recognize strongly aberrated wavefronts. Numerous algorithms are presented, which are suitable to use the extensive raw data to get some significant coeffcients. In addition to a modal approach with Zernike Polynomials, alternative possibilities of representation of the wavefront with non-modal and heterogeneous procedures are presented. Within the framework of this thesis, extensive measuring software was developed. An additional program that simulates image data was developed, with which a great number of parameters can be varied and aberrations in the form of Zernike Polynomials up to 10th arrangement can be used. In addition to simulations, results of measurements at representative human eyes are presented. Finally, a conclusion and a view on possible future evolution is given.
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