I am always seeing sparkles. The sparkles look like a TV with bad signal. You know when it's a bunch of black and white dots? Except, the sparkles that I see are clear. And they are everywhere. Plus, sometimes if I look at something for longer than 10 seconds, everything around that object becomes very dark. Randomly, my vision will get darker or lighter. Along with these weird eye symptoms, I feel dizzy. I am absolutely paranoid, and think I am going to pass out as soon as I feel slightly light-headed. These symptoms can come randomly. Mostly in the afternoon when I am at school, sitting down for a long time.