Summary. Free-living amoebas, members of the genus Acanthamoeba are ubiquitous microorganisms that can be found in the soil, waters and dust. In immunosuppressed patients they are described as etiological agents of granulomatous amoebal encephalitis, pulmonary and skin infections. Acanthamoebal keratitis is described in previously healthy people which wear contact lenses. It is a serious disease which unrecognized at the right moment could cause losing of sight and eye. In this article we describe a female patient in whom acanthamoebal keratitis was diagnosed.