ABCA4 and retinitis pigmentosa 1: Looking at the distributions of confirmatory genes for both groups, namely, patients with indication of RP and the unspecific IRD group (Figure 2), a predominance of patients with pathogenic variants identified in ABCA4 was clearly visible in the unspecific IRD group, whereas USH2A, EYS, and PRPF31 genes contributed the most to the genetic diagnosis of patients in the RP group.