Well, yes, it is possible for your eyes to have dilated pupils when you have seizure. First, you should know that high blood pressure can lead to dilated pupils. So when you have seizure, it will just make you have high blood pressure. And then in that situation, it can just affect your eyes, and you will have high eye pressure. And then it will lead to dilated pupils. Also, anxiety can be the cause too. So just be careful about it. When dilated pupils occur, the black part of the eye will be bigger than normal. In other words, we can say that dilated pupils look like a big black circle. Besides, drug use, illness, and trauma are other causes.