Sandy environment! (The roads that are generally easy to ride in the country are full of wind and sand. After all, when will the old-fashioned trucks be retired?)
Wild environment! (Imagine flying insects in your eyes)
Daytime glare section! (This is the key factor. It absorbs and reflects ultraviolet rays under strong light and cold strong light under sunlight, because in a strong light environment, sunlight reflects various rays and strong light on the road or other environments, which can cause eye fatigue, soreness, etc. The feeling of discomfort, the common cycling glasses are not like sunglasses, they are basically light-colored, which can effectively absorb and reflect rays to prevent eye fatigue)
