Well, Generally speaking, it is possible to have watery eyes after the sinus surgery. You should know that your watery eyes are often a sign of dryness. As we know that tears are for lubrication and for keeping your eyes clean. So when your tear glands have suffered some infection, and work in a wrong order, it may lead to some symptoms, such as watery eyes. And after you have got the eye surgery, your eyes are more sensitive and fragile than normal. And at that moment, it will make your eyes infected easily. After the surgery, just pay more attention to your eyes.