 Study Procedures: Consenting patients undergoing topical PGA treatment in both eyes were asked to discontinue the PGA in their best eye and to continue the administration of PGA in the contralateral eye. All measurements were taken before PGA cessation Visit 1 and repeated 6 weeks after cessation Visit 2. Patients then restarted the application of PGA to the experimental eye and all measurements were repeated once more after an additional 6 weeks Visit 3. 