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“Diagram illustrating the points at which incident rays meet the retina. xx, optic axis; k, first nodal point; k’, second nodal point; b, point where the image of B would be formed, were the eye properly accommodated for it; a, the retinal point where the image of A would be formed.” —Martin, 1917


H. Newell Martin, The Human Body (New York: Henry Holt and Company, 1917) 268


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