<prompt> Retinitis pigmentosa is not associated withUsher syndromeRefsums syndromeLaurence-Moon-Biedl syndrome:Marfan syndrome  <response>: Associations of retinitis pigmentosaI. Ocular associations. These include myopia, primary open angle glaucoma, microphthalmos, conical cornea and posterior subcapsular cataract.II. Systemic associations. These are in the form of following syndromes:1. Laurence-Moon-Biedl syndrome: It is characterized by retinitis pigmentosa, obesity, hypogenitalism, polydactyly and mental deficiency.2. Cockaynes syndrome: It comprises retinitis pigmentosa, progressive infantile deafness, dwarfism, mental retardation, nystagmus and ataxia.3. Refsums syndrome. It is characterized by retinitis pigmentosa, peripheral neuropathy, and cerebellar ataxia. 4. Ushers syndrome. It includes retinitis pigmentosa and labyrinthine deafness. 5. Hallgrens syndrome. It comprises retinitis pigmentosa, vestibulo-cerebellar ataxia, congenital deafness and mental deficiency. Ref: Khurana; Comprehensive Ophthalmology; 4th edition; Page no: 269 