RTN4IP1 and Leber hereditary optic neuropathy: While dominant optic atrophy and Leber hereditary optic neuropathy (LHON) are the predominant forms of hereditary optic neuropathy (5), other rare diseases such as Bosch-Boonstra-Schaff optic atrophy syndrome (BBSOAS), SSBP1 or RTN4IP1 optic neuropathy, or Costeff syndrome should also be considered in the differential diagnosis (6).