The PD of the CC in each RP group was slightly different from that of the retinal vessels, with parts affected in the EYS (part2: 6.15%, P = 0.041), PRPH2 (part2: 10.10%, P < 0.001; part5: 14.11%, P = 0.008), RPGR (part5: 11.45%, P = 0.001), and USH2A (part5: 8.60%, P = 0.024; part8: 6.14%, P = 0.013) groups. This evidence concerns the gene RPGR and retinitis pigmentosa 1.