Acute cocoa supplementation enhances the visual performance of young adults. Cocoa improved reading of low contrast letters, and detection of motion. We propose that increased blood flow to the retina and brain explains this. We also replicated the recent finding that cocoa improves cognitive ability. Dark chocolate has higher concentrations of flavonoids, the antioxidant compounds also found in teas, some fruits, and red wine. The scientists say these flavonoids are able to increase blood flow to the brain and the retina of the eye.This means a piece of high quality dark chocolate could help you see better in low-contrast conditions. The results were said to be most pronounced in those over the age of 25.In addition, like the beta-carotene in carrots, dark chocolate contains a small amount of vitamin A, which protects against macular degeneration.