Development and Evaluation of Functional Visual Field and Navigation Endpoints in Moderate to Profound Inherited Retinal Disease (DEFINE-IRD)

This observational, non-interventional study is designed to assess both the operational feasibility and the measurement properties of selected visual function assessments in this population. The study will emphasize outcome measures that are sensitive to peripheral visual function and that reflect real-world functional abilities, including spatial orientation, mobility, and wayfinding.