RPGR and glycogen storage disease VI: Two patients are reported to carry RPGR variants and sectoral disease (Table 1): 1 of those patients had impaired central vision with asymmetry between the eyes (0.48 and 1.3 LogMAR),4 and the other was described as having cone-rod dystrophy (rather than RP-related rod-cone dystrophy) and sectoral disease, also presenting with impaired central vision.21