**2.1.1 Demographics**

Between 2001 and 2006 we treated 11 patients with Acanthamoeba keratitis. The mean age of the patients was 30.2 years (16-65). The eight female and three male patients were all soft contact lens wearers. The right eye was affected in six and the left in five cases. 82% of the infections occurred in the summer period between June and September. The appropriate diagnosis of Acanthamoeba keratitis took 3 days to 2 months. Beside long-lasting conservative treatment perforating keratoplasty was performed in six cases. In the following we discuss these patients in details.
