By Hugo Francisco de Souza Reviewed by Susha Cheriyedath, M.Sc. Feb 4 2026 A large retinal imaging study suggests a common diabetes drug may help slow progression toward sight-threatening macular degeneration, though clinical trials are still needed to confirm any protective effect. Study: Metformin and incidence of age-related macular degeneration in people with diabetes: a population-based 5-year case-control study . Image Credit: reddees / Shutterstock In a recent study published in the