[Leber's hereditary optic neuropathy--two case reports].

AIM: The aim of the article is to present 2 cases of LHON revealed in cousins (patients' mothers were sisters). MATERIAL AND METHODS: They were both diagnosed in the Molecular Medicine Faculty and Department of Ophthalmology, Medical University of Wrocław. RESULTS: Three of the most popular mutations characteristic for Leber's hereditary optic neuropathy were negative in both patients. CONCLUSION: The patients might have some rare, wild or unidentified mutations. Leber's hereditary optic neuropathy, mtDNA, LHON.