The distribution of refractive indices in the crystalline lenses of rabbits was measured with a newly developed optical system. The distribution was assumed to be represented by n=n0-[Z2/A2+(X2+Y2)/B2],where n0 is the index at the center, Z, X, and Y are coordinates, and A and B are constants. Longitudinal spherical aberrations were calculated by ray tracing on models defined by the above equation, and it was found that such a distribution of refractive indices in the crystalline lens plays a very important role in decreasing the spherical aberration and increasing the refractive power.
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Nakao et al. (1968) studied this question.
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