I had pterygium surgery 2 and a half weeks ago. i am using the thiotepa drops. I am having post operative symptoms that my eye doctor is not familiar with. I have periods where the eye gets teary and i have a hard time keeping it open. It is the type of feeling that you have when you're extremely tired and trying to keep your eyes open. Has anyone had pterygium surgery and what did you experience afterwards? I would appreciate any information....thanks.