_:vb50943065 . _:vb50943065 "A retinitis pigmentosa that is characterized by onset of symptoms in the fifth or sixth decade of life."^^ . _:vb50943065 . _:vb50943065 "url:https://www.ncbi.nlm.nih.gov/pubmed/1424244"^^ . _:vb50943065 . _:vb50943065 . _:vb50943065 .