2011/10/01 by Stephen G. Odaibo, Odaibo, Stephen G.
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #FOS: Biological sciences #FOS: Physical sciences #Optics (physics.optics) #Tissues and Organs (q-bio.TO) #physics.optics #q-bio.TO
paper · pdf · doi:10.48550/arxiv.1110.0081
19 pages, 3 figures
arxiv created 2011/10/01 · arxiv updated 2015/03/19
In this article, we follow the trajectory of a photon in the human cornea. Prior to experimental evidence of the cornea's gradient refractive index (GRIN) nature, schematic eye models used a constant or average as the corneal refractive index. A few recent models respect the intra-corneal GRIN, but are based on the paraxial approximation, and thereby have limited validity in peripheral visual field analysis and non-paraxial photon tracking. Here, we introduce the Trajectron algorithm. It uses a closed form solution of the ray equation of constant axial GRIN media, and evaluates over piece-wise constant GRIN. Using Trajectron, we present the first quantitative demonstration of non-paraxial intra-corneal light-bending phenomena. This demonstration has significant implications in the development of refractive surgery algorithms.