Eating just one orange a day can slash your risk of developing macular degeneration by 60%. A recent study in the American Journal Of Clinical Nutrition followed 2,000 patients over the age of 50 for 15 years and found that the patients who ate an orange a day had a significantly decreased risk of AMD (age related macular degeneration) compared to those patients who ate no oranges at all. Usually research involving oranges concentrates on the effects of the vitamin C, E, and A the oranges contain, but this study put an emphasis on theflavonoids found in oranges. Flavonoids are powerful antioxidants that have immune and anti-inflammatory effects and are found in most fruits and vegetables. 
The study examined other foods that have flavonoids such as tea, apples and red wine (yes please) but for some reason oranges were the only food that aided in the prevention of AMD. The authors of the study acknowledge that more research has to be done before doctors can definitely prescribe an orange a day to keep AMD away.
Park Eye Center 