About two years ago our attention was drawn to glassy ring-like structures at the periphery of the posterior surface of the cornea. It soon became evident that these bands corresponded to the so-called posterior embryotoxon of the cornea (Embryotoxon corneae posterius, Axenfeld1), posterior marginal dysplasia of the cornea (Streiff2), congenital hyaline membranes on the posterior surface of the cornea (Mann3), or peripheral refractile postcorneal rim (Graves4). Once our interest in this subject was awakened, we devoted a close study to the limbus of all patients whom we saw and performed a slit-lamp gonioscopic examination on those who presented to external slitlamp study an unusual appearance of the limbus or of the periphery of the cornea.
These clinical investigations were followed by a careful study of 600 pathologic specimens of eyes, and this study, in turn, prompted us to extend our investigations to the chamber angle of
BURIAN HM, BRALEY AE, ALLEN L. Visibility of the King of Schwalbe and the Trabecular ZoneAn Interpretation of the Posterior Corneal Embryotoxon and the So-Called Congenital Hyaline Membranes on the Posterior Corneal Surface. AMA Arch Ophthalmol. 1955;53(6):767-782. doi:10.1001/archopht.1955.00930010775001