Publications [#186537] of Yakir Gagnon

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Published Abstracts

  1. Y. Gagnon, R. H. H. Kröger, Gradient Index Models of Monofocal and Multifocal Spherical Fish Lenses, The Association for Research in Vision and Ophthalmology, vol. B76 (2007) .
    (last updated on 2011/01/16)

    Abstract:
    Many fish lenses are spherical in shape. Interestingly, they are corrected for longitudinal chromatic aberration (LCA) by longitudinal spherical aberration (LSA) of complex shape. This leads to multiple focal lengths in a single lens. Each focal length focuses a different spectral band on the retina. This is achieved through the refractive properties of the lens. Since the lens is constructed out of layers of cells, the lens is radially symmetrical, thus having a gradient of refractive indices from the centre of the lens to its periphery. The precise shape and the nature of this multifocal refractive index gradient remained unknown. A ray-tracing model was therefore constructed to explore the internal optical structure of fish lenses.