@mothninja my father (91) has dry macula and uses "AREDS2". vitamin supplement. Maybe an option? (there is also a lot of other information in the article)
Al the best for your dad and you!
www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/age-related-macular-degeneration/nutritional-supplements-age-related-macular-degeneration