Hi agileyes, after 9 years I guess you won't see this, but did you ever find out what was causing your condition?
It seems I have something very similar, eg lights seen with movement of one of my eyes, but only when fairly light.
Four months ago, I had flashes of light in my vision and increased floaters. I went to my optometrist who I completely trusted and he diagnosed me with a vitreous detachment and said everything was fine. I went back several days later with increased symptoms and he thought I had a tiny tear in my retina. He sent me to a Opthamologist - Retinal Specialist and I had a massive detachment and was rushed into surgery within hours at the hospital to save my vision. I had very complicated surgery and it has been a very long road to recovery that I am still on. I think you need to see an Opthamologist and not take any chances. If you catch a problem early it is a lot simpler to fix, trust me.
I would see an ophthalmologist. This is probably vitreous traction on the retina.
Dr. O.