RHO and Usher syndrome: There was no significant difference in BCEA in degrees2 between the participants with eccentric fixation and the participants with Usher syndrome or RP regardless of visual acuity (P = 0.052 for comparison with USH2A with BCVA equal to or better than 20/25, P = 0.55 for comparison with participants with USH2A with BCVA equal to or worse than 20/30, and P = 0.15 for comparison with participants with RHO mutations).