In 1948 Posner and Schlossman1 proposed that the retinal nerve fibers arising between the optic disk and the macula must approach the optic nerve via a different course from that commonly believed to be used, if a number of visual field phenomena encountered clinically were to be explained (Fig. 1).1,2 They suggested: (1) that the fibers arising from ganglion cells of the papillomacular area (P-M area) arch away from the horizontal meridian to enter the optic nerve nasally at its superior and inferior margins, and (2) that these fibers do not pass directly into the temporal side of the optic nerve with macular fibers. This theory has gained wide acceptance in current ophthalmologic textbooks,1,3,4,5 although it has not been supported by experimental observation. The following is the report of an anatomic study in the primate designed specifically to examine the validity of the Posner-Schlossman
HOYT WF, TUDOR RC. The Course of Parapapillary Temporal Retinal Axons Through the Anterior Optic Nerve: A Nauta Degeneration Study in the Primate. Arch Ophthalmol. 1963;69(4):503–507. doi:10.1001/archopht.1963.00960040509014
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