Foundation Fighting Blindness and Usher 1F Collaborative to Launch Natural History Study The project will help identify outcome measures for future clinical trials of potential USH1F therapies. News provided by Share this article COLUMBIA, Md., April 29, 2021 /PRNewswire/ -- Foundation Fighting Blindness, the world's leading organization committed to finding treatments and cures for blinding retinal diseases, is partnering with the Usher 1F Collaborative, a family-founded nonprofit driving research for Usher syndrome type 1F (USH1F), to launch a natural history study, the Rate of Progression in PCDH15-Related Retinal Degeneration in Usher Syndrome 1F (RUSH1F). Additional funding for the project will be provided by the Marjorie C. Adams Trust.