Modern urban people nowadays spend a large amount of time reading, browsing and playing in front of screens of computer, tablet and smart phone, which, on one hand, quite easily makes eyes tired; on the other hand, causes a great deal of harm to the health of eyes. To address the problem of excessive use of eye, Jiangzhong Group selected from a variety of eye-caring foods the best, blueberry and wolfberry, and made the Langou Beverage. The Langou Beverage, with the use of a unique extraction technique of Jiangzhong Group, contains the effective components of blueberry and wolfberry. In order to ensure the improvement of vision, each tin of Langou also contains plenty of anthocyanin. Langou, made from sour blueberry and sweet wolfberry, is both inviting and tasty, and has a sparkling color of red wine.