Introduction and aims: Microbial keratitis is a severe and sight threatening complication of contact lens use. We wanted to examine patient knowledge, incidence, causative organisms, early symptoms, any delay before starting hospital treatment, and clinical outcomes of microbial contact lens related keratitis at Oslo University Hospital. Methods: All patients with contact lens related keratitis admitted to the hospital between 01.01.18 and 31.12.18 were interviewed using a questionnaire form. Patients were asked about their knowledge of microbial keratitis, use of contact lenses, where they purchased them and time from first symptoms to hospital treatment. Clinical information was collected from medical records. All eyes were photographed. Results: 12 cases of contact lens related microbial keratitis were found. The incidence was calculated to 1,23 per 10 000 contact lens users. 50 % were men. The average age was 52,4 years. 7 patients had not used their contact lenses according to recommendations and 7 had no prior knowledge about keratitis. Microbial cultures were positive in 8 patients. Pseudomonas aeruginosa was found in 6 patients, and Acanthamoeba in the remaining 2. 10 of the patients experienced subjective delay in getting adequate treatment. Conclusion: Most patients had no knowledge of keratitis and did not use their contact lenses correctly. There was delay in getting proper hospital treatment. Average age was surprisingly high. Contact lens users need to be better informed about correct use of contact lenses and about possible complications in order to avoid this serious, sight threatening infection.