Well, according to your description, I can see that there is something strange to your eyes after the eye exam. Anyway you should not be much too worried about it, maybe the symptom would simply go away before long. However, if the situation remains bad, you should consult a doctor and figure out where went wrong. Maybe it is just a temporary reaction of your eyes.
Well, it you just feel eye twitching for a few minutes, then it's okay. On the contrary, if you constant feel eye twitching, you should seek advice from an ophthalmologist and get some notes to protect your eyes. Actually, some people are easy to sensitive to some drops and light and items what are used during exam. That does not mean there is something wrong with your eyes. But you also need to take a good care of your eyes if you wanna have bright and colorful world. By the way, don't rub your eyes if you feel some uncomfortable in your eyes, no matter eye twitching or eye pain, it only can make your conditions much worse than before.
Well, generally speaking, it can be normal to have itchy eyes after you have taken the eye exam. In my opinion, when you have an eye exam, it will make your eyes focus on the points for a long time. And then the light can go through your eyes to check it. In this way, it can lead eye strain. And then lead to eye pressure. As we know that eye pressure can lead to some eye problems, such as itchy eyes. Also, you should know that if your eyes are not accustomed to the new situation, it can react as the itchy eyes too. So just console with your eye doctor, and he can just give you some advisable suggestion. So you should not worry about it.