First, both blueberry and blueberry contain an anthocyanin component, which can activate retinase, activate and promote the biosynthesis of rhodopsin, improve human visual acuity and accelerate the adaptability to dark environment. In addition, anthocyanins can regulate the blood microcirculation of retina and enhance the protection of capillaries by accelerating the exchange of substances, so they also have strong antioxidant effect. In terms of content, blueberries are about 4 to 5 times higher than blueberries.

Second, cranberries and blueberries are good for the eyes, but the effect is that cranberries are better for the eyes. Because rhodopsin contained in blueberry is the basic substance for eyes to produce vision, and flavonoids can improve the microvascular circulation of eyes. In addition, blueberry is also called "breakfast for pilots", and blueberry jam is arranged in the breakfast of European and American air forces to help pilots improve their eyesight, which is enough to prove the role of blueberry in maintaining or improving their eyesight.