Tiny pixel white dots in entire vision.

I am seeing tiny white pixel dots in vision only after waking up and after closing eyes for few seconds. After waking up, I turn on led white light in my room for working at 6 am. Then I see things which are around me for some time. And Then I close my eyes for few seconds whether those white dots are coming or not. Its coming for daily but only for one time. It goes automatically If I open eyes immediately and seeing things which are around me and  laptop with out blinking for few seconds, no issues. Sensation is like tiny dots evaporating faster. Only visible when eyes closed for first time  after waking up. 6 months back I got sudden eye floaters.went to doctor and confirmed no tear or hole.  I am also having potential after image problem for zebra patters (white and black stripped lines) for few seconds. Please assist.