Comput Methods Programs Biomed - Fast ray-tracing of human eye optics on Graphics Processing Units.

Tópicos

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Resumo

We present a new technique for simulating retinal image formation by tracing a large number of rays from objects in three dimensions as they pass through the optic apparatus of the eye to objects. Simulating human optics is useful for understanding basic questions of vision science and for studying vision defects and their corrections. Because of the complexity of computing such simulations accurately, most previous efforts used simplified analytical models of the normal eye. This makes them less effective in modeling vision disorders associated with abnormal shapes of the ocular structures which are hard to be precisely represented by analytical surfaces. We have developed a computer simulator that can simulate ocular structures of arbitrary shapes, for instance represented by polygon meshes. Topographic and geometric measurements of the cornea, lens, and retina from keratometer or medical imaging data can be integrated for individualized examination. We utilize parallel processing using modern Graphics Processing Units (GPUs) to efficiently compute retinal images by tracing millions of rays. A stable retinal image can be generated within minutes. We simulated depth-of-field, accommodation, chromatic aberrations, as well as astigmatism and correction. We also show application of the technique in patient specific vision correction by incorporating geometric models of the orbit reconstructed from clinical medical images.

Resumo Limpo

present new techniqu simul retin imag format trace larg number ray object three dimens pass optic apparatus eye object simul human optic use understand basic question vision scienc studi vision defect correct complex comput simul accur previous effort use simplifi analyt model normal eye make less effect model vision disord associ abnorm shape ocular structur hard precis repres analyt surfac develop comput simul can simul ocular structur arbitrari shape instanc repres polygon mesh topograph geometr measur cornea len retina keratomet medic imag data can integr individu examin util parallel process use modern graphic process unit gpus effici comput retin imag trace million ray stabl retin imag can generat within minut simul depthoffield accommod chromat aberr well astigmat correct also show applic techniqu patient specif vision correct incorpor geometr model orbit reconstruct clinic medic imag

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