Well, it can be watery eyes. In my opinion, it is very normal to have this situation. The light is so strong that when we open our eyes to see it and our eyes are so very sensitive that they will react to the stimulation from sun light. So when the sunlight is getting into our eyes, it will make our eyes to adjust to it. And then that is why your eye is watery. Besides, there are many dirty objects in the air, and your eyes are different from each other, when faced with the dirty objects. One eye can be infected easily, leading to watery eyes. In this situation, maybe you should go and see a doctor so that you can talk about your problems, then can have the eye exam.