Well, when dilated pupils occur, the black part of the eye will be bigger than normal one. And you will feel painful in some cases. To treat it, the first thing you can do is to make sure you wash your eyes frequently. Also, it is also important to apply cleansing eye drops to get rid of any foreign particles. For the home remedies, 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. By the way, you should know that when you suffer dehydration, your body will be disordered. So at that moment, you may suffer high blood pressure too. And then it is possible to lead to dilated pupils. Also, some factors, such as high blood pressure and anxiety, drug use, illness, and trauma can lead to it. Anyway, just be careful.
Dilated eyes would be resulted from a lot of causes, some of them are traumatic, some of them are internal. In a word, if you want them to be recovered soon, you have to figure our the causes that led to your dilated eyes and take relevant measures. Generally speaking, temporary dilated eyes would last several minutes to several hours, but some resulted from traumas would last long, you should have your eyes carefully checked.
Generally speaking, the eye dilation caused by the surprise and shocking problems may get released by itself soon. In order to speed up the eye dilation recovery and make your eyes feel better, you could use the eye drops to release the symptom. After using the eye drops, you will feel comfortable at the eyes. You could also close your eyes and calm down for a while which will also make your recovery soon.