ATXN1 and spinocerebellar ataxia type 1: Despite these evidence [6,10,12], there is a lack of information about the morpho-functional condition of the macular elements, the RGCs and of the optic pathways in those SCA1 patients, presenting the peculiar status of harboring the ATXN1 gene mutation but with absence of any clinical neurological signs [not symptomatic carriers (NSC)] at this stage of disease.