I have floaters on both eyes. But for few days i found when I awake from sleep if I look at the wall I see many black lines (like branches of tree without leaves) in my vision and then the lines fades out. The lines does not float but if I close my eye for 20-30sec and open I found new formation of lines. I does not see this lines when I awake even if I close my eyes for few sec/min. Please advise why this happens? Please help in details.