I have them too, I was concerned about my eyes and went to the doctor where he explained to me it is normal for most people to have them, but sometimes if your eye goes completely with floaters or you have a high density of them, or if you have a dead spot in your vision, you should go see the doctor immediately because you could be getting retinal tears. He also explained they are most common when you are looking at high intensity colors, like white. I see them the most when I'm snowboarding because the sun on the snow makes the snow very intense and bright.