“…After the introduction of antibiotics, the same line was followed by topical administration prior to ocular surgery (Dunnington & Locatcher-Khorazo 1945, Hughes & Owens 1947, Dellaporta et al 1949, Locatcher-Khorazo 1953, Callahan 1953. However, in later years, with the experience gained from general surgery, some authors (Leopold 1958, Leopold & Apt 1960, Kolker et al 1967 1) doubted the prophylactic role of antibiotics before surgery and warned of the danger of altering the local conjunctival flora, thus permitting the development of pathogens which flourish only because competitive organisms have been inhibited. Consequently, many surgeons today either use no antibiotic prophylaxis prior to surgery (Chalkley 1963, Hallermann 1963, Nolan 1967, Constantaras et al 1972, Jaffe 1972, or compromise by giving a single dose pre-or peroperatively (Aronstam 1964.…”