That may be dry eyes and eye strain cause. As a matter of fact, it is not a sign of some eye problems. If you always read books, stare computer and driving in a long time, eye dry and eye strain are easy to accompany you which may be let your eye keep watering. If not so, see a doctor at once to determine the real factors. So you can do as follows: consult an optician and he'll give you some special eye drops, or you could try and buy some allergy drops first and see if that solves it.
It's probably because of the dry weather. When your eyes are dry the tears don't coat your eyes but instead "break apart." I use Refresh lubricant eye drops. They are made by the same company that makes Restasis which is a prescription. Also, if you have any kind of rhinitis or sinus infection/inflammation that can effect the way your tear ducts work.If you decide to use drops, lubricant or otherwise, make sure to buy the individual vials not the single bottle because of the bacteria build up. And if you want to make your eyes feel good while using the drops, store them in the fridge.
Well, for your situation, I can give some reasons. First, it can be the light problem. As we know that the light is so strong that when we go out and open our eyes to see it, it will just make the eyes be hurt. And also our eyes are so very sensitive that they will react to the stimulation from sun light. When the sunlight gets into our eyes, it will make our eyes to adjust to it. And at this time, it will water. So it is very normal. Second, it can be because of the dirty objects in the air outside, so when you go out, your eyes are easy to be infected by them. In this situation, we can say that, it can be possible that you are getting the dry eyes, for dye eyes are caused by the irritants. So just be careful about it. For your situation, maybe you should go and see a doctor so that you can talk about your problems, then can have the eye exam. Also, before you have an eye exam, you are not supposed to have your eyes exposed under the sunlight for a long time, also should be careful about the dirty things outside. Anyway, just be careful about it.
Yes, the continuing watering from the outer corner of the eyes is a sign of the eye problem. Once your eyes are tired because of the long time use in front of the electric products with no rest, your eyes tear system will work in disorder. Your eyes will excrete the things with no control. Or your eyes may get the inflammation. You should go to have a check on the eyes through the doctor.