By contrast, syndromic RP is associated with systemic abnormalities such as Usher syndrome (USH)—a ciliopathy characterized by retinitis pigmentosa and sensorineural hearing loss, Bardet–Biedl syndrome (BBS)—a multisystem ciliopathy featuring retinal degeneration, obesity, and polydactyly and rarer genetic disorders including PHARC (polyneuropathy, hearing loss, ataxia, retinitis pigmentosa, and cataract syndrome), PCARP (photoreceptor ciliopathy and retinal pigmentation), and Oliver–McFarlane syndrome (OMCS) [15,16]. This evidence concerns the gene ABHD12 and Usher syndrome.