IMPG2 and retinitis pigmentosa: The heterozygous form of the IMPG2 gene in the first case can cause a vitelliform macular dystrophy-associated phenotype in the case of the heterozygous complex allele in IMPG2 [21], while the biallelic mutation in IMPG2 can be related to the retinitis pigmentosa, which leads to early macular involvement [22].