Well, generally speaking, it is normal to have headache after you have taken the surgery. Of course there are many factors which can lead to headache such as cold, even the bleeding and injury in your brain. But for surgery, according to some experts, eye strain can be the common reasons which will lead to headache. For example, after you have taken eye surgery, your eyes will be sensitive. And when you overuse your eyes, eye pressure will be higher, leading to eye strain. And then it will affect your brain nerve system, leading to pain and headache. And that is why headache can occur. So you should not overuse your eyes, and avoid watching tv too long time. Anyway, just be careful about it.