Jimara

I started getting the "Blue Dots" or "Blue Sparks" in 1994. They would startle me at first. I thought maybe it was from using the computer and messing up my vision. Thru the years, I have also seen Red Dots. And occasionally purple, yellow dots. But they are mostly Blue or Red. I'm wondering what they are. Not many people have this visual defect. These are like small spark-like dots. They last a few seconds then fade away. They stay in one area and disappear. They are not floaters. They don't follow your eye movement like floaters do. I still get them. What are these?