Journal
VISION RESEARCH
Volume 41, Issue 8, Pages 973-979Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0042-6989(01)00011-6
Keywords
refractive index distribution; fish lens; lens models; magnetic resonance imaging
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The gradient refractive index of the crystalline lens in the Black Oreo Dory (Allocyttus Niger) was determined using two methods; an optimisation program based on finite ray-tracing and the path of laser beams through the lens, and magnetic resonance imaging (MRI) and the linear relationship between refractive index and nuclear transverse relaxation rates. The methods showed good agreement in the cortical zone of the lens, but the lack of free water in the core of the lens made MRI measurement impossible in this region. The laser-optimisation method gave mean values of 1.368 and 1.543 for the surface and core refractive indices respectively, with a radial distribution for the gradient refractive index given by n(r) = 1.543 - 0.121r(2) - 0.033r(4) - 0.021r(6). (C) 2001 Elsevier Science Ltd. All rights reserved.
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