“…Symptomatic chiasmal and retrochiasmal involvement is infrequent. Complete homonymous hemianopias (Bielschowsky, 1933;Boldt, Haerer, Tourtellotte, Henderson, and DeJong, I963;Chamlin and Davidoff, 1954; Kahana, Leibowitz, and Alter, 1971;Luhan, I944; Vedel-Jensen, I959), quadrantic defects (Bjerrum, I890;Boldt and others, i963;Chamlin and Davidoff, I954;Franqois and Verriest, 1957;Ronne, 1912, I915;Traquair, 1942,) homonymous scotomas (Boldt and others, I963;Chamlin and Davidoff, 1954; Franqois and Verriest, I957; Otradovec, I965; Ronne, 1912, 19I5;Traquair, I942;Vedel-Jensen, 1959), and other unspecified types of homonymous defects (Croll, i965;Kurtzke, Beebe, Nagler, Auth, Kurland, and Nefzger, I968;Leinfelder, 1950;MUller, 1949) have been found in up to 3-5 per cent of cases (Boldt and others, I 963;Croll, I 965;Kahana and others, 1971;Kurtzke and others, I968;Leinfelder, 1950;Muller, 1949;Savitsky and Rangell, 195ob). One of Bielschowsky's cases had bilateral involvement at different times (Bielschowsky, 1933).…”