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January 1947


Arch Ophthalmol. 1947;37(1):83-84. doi:10.1001/archopht.1947.00890220090009

IN TWO previous communications1 it was shown how the location and displacement of the cardinal points of the eye can be visualized and remembered by the use of the benzene ring. It was shown that when the eye accommodates the new position of the cardinal points can be represented by a long, slender ring situated inside the regular ring. When the crystalline lens is removed from the eye, the optical system of the eye is radically altered. Its refractive power has been decreased by about one fourth, and there has also been a shifting of the cardinal points. It can be shown similarly that the location and displacement of the cardinal points in the aphakic eye can be represented by a broad and flattened ring drawn from the regular ring representing the normal static eye.

In the accompanying figure, the principal and nodal points of the aphakic eye are