PDE6B and retinitis pigmentosa: Patients 1B, 2A, and 2B had mid-peripheral retinitis pigmentosa, concentric visual field ring scotomata in both eyes (OU), extinguished electroretinogram (ERG), and homozygous pathogenic variants in the <i>PDE6B</i> gene c.1540del PLeu514Trpfs*61.