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Performance on the optokinetic visual screening test expressed as the mean frequency of tracking a moving 2° and 8° grating for 2 minutes at (A) 13 months: Opa1+/− mice (N = 14) and C57Bl/6 controls (N = 14) and, (B) 18 months: Opa1+/− mice (N = 12) and C57B6 controls (N = 12). ** P < 0.001, * P = 0.003, and NS = non significant at P = 0.082.
