Abstract
Solution of the equation that describes simulatenous liquid flow and diffusion in a spherical model of the vitreous body of the eye shows that a small dissolved specie can move both anteriorly and posteriorly from a source behind the lens even though there is a slow liquid movement almost entirely in the posterior direction. This results explains why tracer studies using large particles (dyes or colloids) show only a posterior flow, whereas studies using sodium ion show anterior movement as well.
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Literature
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Fatt, I. Flow and diffusion in the vitreous body of the eye. Bltn Mathcal Biology 37, 85–90 (1975). https://doi.org/10.1007/BF02463495
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DOI: https://doi.org/10.1007/BF02463495