Well, in my opinion, you can watch tv and it can be fine. But on the other hand, you should not overuse your eyes through watching tv. Generally speaking, when dilated pupils occur, the black part of the eye will be bigger than normal one. And you will feel painful in some cases. And at this time, you should avoid overusing your eyes, or it will just make your situation more serious. And in common, for the treatments, it is important to apply cleansing eye drops to get rid of any foreign particles. Also, you can try some cool teabags, and just put them on your eyes, maybe it can be effective. Of course, cool cucumbers can be used too. And if you watch tv too much, you may suffer high blood pressure too. And then it is possible to make your situation worse. Anyway, just be careful.