USH2A and respiratory distress syndrome in premature infants: Herein, the top two common with CNVs in Chinese IRDs patients were EYS and USH2A, which are two of the largest IRD genes with a high prevalence in the Asian and global population (Gao et al. 2021; Pontikos et al. 2020; Su et al. 2022; Yang et al. 2020).