Well, generally speaking, it will just take several days to your eye dilation to go away. So you can just not be worried about it. Also, you should know that dilated pupils occur, when the pupils, the black part of the eye are bigger than normal. And there are many different factors which can cause pupils to be dilated, such as high blood pressure and anxiety. Besides, drug use, illness, and trauma are other causes. So you should pay attention to them. For example, when you are anxious, your blood pressure will become high. In this way, it will affect your eye pressures. In some degree, it can lead to dilated pupils. And in my opinion, you can go and have a test in the hospital.