“…Most literature on this subject concerns the relationships of CD with glaucoma. Of particular significance are the studies of Elschnig [1928], Wolfj [1947], Radnot [1949], Magitot [1953], Redslob [1955], Zimmerman [1958], Ho gan and , Teng [1964], Zimmerman el al. [1967], Lampert et al [1968], Our knowledge of etiopathogenesis, the frequency and the importance of the lesion under examination, is still slight and frag mentary.…”