The numerous antioxidants in all types of berries help the body fight oxidative stress, and this is crucial for the eyes. With age, many parts of the eye will degenerate, but berries can slow this process down and preserve good eye health. The more (natural) colors on your plate, the better!
Mix all ingredients in a blender until blended. Pour and serve.
You may also chill for a few hours or add ice cubes.