I'm Looking For Some Answers Regarding A Strange Vision Phenomenon

I'm looking for some answers regarding a strange vision phenomenon that happens occasionally to me. Usually during a time of low physical activity, my eyes will slowly become unfocused. Bright static-llike shapes and lines appear over my vision and shimmer, as if I've looked at a bright object for too long. It is always in a random pattern. Some places will be unaffected at the same time. I lose the ability to focus and read in the part of my eye that I can see past the static. I also become very disoriented and mentally vague. I become I able to think clearly. I have not been able to isolate things that trigger the episodes, nor do I know how to get rid of them. They eventually slowly fade out the same way they faded in. Please, any suggestions you have would make a difference.