Effects of the Argus II Retinal Prosthesis System on the Quality of Life of Patients With Ultra-Low Vision Due to Retinitis Pigmentosa: Protocol for a Single-Arm, Mixed Methods Study. - White, Judith; Knight, Laura; Cruz, Lyndon da; Stanga, Paulo E; Patrick, Hannah; Powell, Helen; Berry, Lee; Withers, Kathleen; Carolan-Rees, Grace; Jackson, Timothy L (Journal of Medical Internet Research, 2021)