“…The age, race, sex, geography, emotional or physical stress, and bilaterality represented by these two cases of POHS are consistent with those factors described in large surveys as typical of POHS (Krill and others, I 969;Schlaegel and others, I967;Makley and others, 1965;Maumenee, I965;Gass, I967;Woods and Wahlen, I960; Krause and Hopkins, 1951;Van Metre and Maumenee, 1964;Schlaegel, 1975;Gass and Wilkenson, 1972).…”