ATXN1 and autosomal dominant cerebellar ataxia: Overall, the significantly reduced WR-MT and OR-MT values detected in SCA-ATXN1 Group compared to Controls and the observed not statistically difference of IR-MT, WR-MV, IR-MV, OR-MV observed in concomitance with normal PERG values, but with abnormal mfERG responses, can be explained on the hypothesis that macular changes occur predominantly at the level of the outer retina.