270 Image Analysis and Modeling in Ophthalmology
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For Gaussian beams, input and output rays are computed in the form of a basis vector
incorporating the complex beam parameter. The image size can thus be calculated at any
axial position. In ocular lesion experiments, lasers are often operated in the fundamen-
tal transversal mode in which the laser beam exhibits axial symmetry and its prole is
described by a Gaussian function. This property is very convenient since a Gaussian pro-
le remains Gaussian after transformation by an optical system. An in-depth discussion
on ray transfer matrix analysis can be found in Gerrard and Burch (1994). Schematic eyes
downscaled from human to monkey and ray-tracing methods have already been ...