When you are blinking, not before, not after, you are causing the same effect as pinhole glasses. Only a small amount of light passes and you see better. But this is irrelevant with clear flashes.
You the blinking relaxed your eyes, then you will have the flashes.
But, if you blinking to cause them yourself, i don't think it will work.
I remember having flashes, many times, when i heaved forget about my eyes, and my memory along with my imagination where temporally improved.
If you found what conditions caused the flashes, and you can remake them at will, you are in a very good way.
What is wrong, is probably that you produced strain when you realized that you have clear vision or something similar. It happens all the time, don't worry.
If you read the Bates Method Books and magazines, you will found many similar cases if i remember correctly...