 Outcome Measures: The primary outcome is the rate of change in area of GA based on grading by an external Reading Center of fundus autofluorescence FAF images in the assigned study eye. The primary outcome will compare the rates of GA area expansion as determined on FAF images before and following the initiation of IP until 24 months of treatment. Secondary outcomes will compare differences in rates of change in best-corrected visual acuity BCVA, low-luminance VA, area of GA based on fundus photography, and macular sensitivity as measured using microperimetry between the run-in and treatment phases. Safety outcomes will include the number and severity of adverse events AEs. Ocular safety outcomes will be indicated by changes in VA, ocular surface changes, intraocular inflammation and any other ocular changes not consistent with the natural progression of GA. 