2. It is recorded in the Records of Shunde County in Xianfeng period of Qing Dynasty: "Looking at the sun in August, you are still eating snails." What's more, children who eat snails in the Mid-Autumn Festival will improve their eyesight. Before frying snails, the bottom of the snails will be removed. When eating, take off the snail cover first and eat snail meat. Then, if you eat snails in the moonlight, their shells will be open from beginning to end. Moreover, the screw cover is similar to the eyes, so eating snails means "improving eyesight".