average GC displacement from  in degrees of visual angle (0.3 mm per degree of visual angle )
Displacement is a function of eccentricity of the GC soma position.
eccentricity of the GC soma position
 N. Drasdo, C. L. Millican, C. R. Katholi, and C. A. Curcio. The length of Henle fibers in the human retina and a model of ganglion receptive field density in the visual field. Vision Research, 47:2901-2911, 2007.
 B. A. Wandell. Foundations of vision. Sinauer Associates, Sunderland, Massachusets, 1995.
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