For topical treatment of external ocular infection such as conjunctivitis caused by Levofloxacin-susceptible strain of Staphylococcus sp., Streptococcus pneumoniae., Micrococcus sp., Enterococcus sp., Corynebacterium sp., Pseudomonas sp., Pseudomonas aeruginosa., Haemophilus sp., (H. influenzae, H. aegypticus [Koch-Weeks bacillus], Moxarella (Branhamella) catarrhalis, Moraxella sp., Morax-Axenfeld bacillus, Serratia sp., Klebsiella sp., Proteus sp., Acinetobacter sp., Enterobacter sp., Propionibacterium acnes.