We examined a 30 years old female patient, which had a paracentral corneal abcess due to contact lens use. We took samples from corneal abcess and fluid in the contact lens and sent for microbiological examination. After taken samples, gatifloxacin was started for antibiotherapy. Stenotrophomonas maltophilia was grew in both samples during microbiological examination. Gatifloxacin antibiotherapy was continued and corneal abcess formation was regressed and treated in the course of therapy.