Well, for your situation, I have to say it can be very common to have it. And according to some experts, it means there is something occurring in your eyes. For example, it can be a serious eye problem that needs immediate treatment. Generally speaking, flashes often accompany with a large number of floaters, small specks, which appear in your line of vision and appear to float or dart from side to side. And that can be annoying. And at this time, I may suggest you should have a good rest for your eyes at first. And then, you can have some cool cucumber under your eyes, so that it can relieve your symptoms. Also, eye drops can be used too. Anyway, just be careful about it.