GJD2 and myopia: Recently, various susceptibility genes have been identified by myopia- or high-myopia-association studies, including transforming growth factor-1 [26], catenin delta 2 [27], BH3-like motif containing cell death inducer [28], gap junction protein delta 2, actin alpha cardiac muscle 1 [29], and Ras protein-specific guanine nucleotide-releasing factor 1 [30].