Abnormalities in the CYBB gene can result in X-linked recessive chronic granulomatous disease (OMIM#306400) or immunodeficiency type 34 (OMIM#300645), and abnormalities in the RPGR gene can result in X-linked retinitis pigmentosa type 3 (OMIM#300029), whose clinical phenotypes include reduced central vision and retinitis pigmentosa. The gene discussed is RPGR; the disease is retinitis pigmentosa.