Are phosphenes caused by eye movement or walking natural in young adults?

[rodrovictor]

Here's a bit of history:
In the last week of June, I started to have flashes that looked like arcs in my peripheral vision. I soon got my eyes checked by a retina specialist and his report said, "Vitreous Liquefaction and no lattice in the periphery". He warned me to get back to him, if things got worse. Over the next two weeks, my flashes became less frequent, but one morning I woke up to find a wispy shadow when I moved my eyes to the side and tilted my head. The shadow disappeared after 10 minutes or so and instead when I move my eyes to the sides- I see a ripple of light (maybe phosphenes). I panicked and went back to the specialist, he checked my eyes very carefully but didn't find any problems. But I still have this weird visual phenomena every time after I wake up in the morning. Also, there are these blobs of light that appear and disappear- they are not floaters. My usual floaters are translucent and dull. I get these blobs of light in the dim conditions and when I am moving around. Are these phosphenes caused by walking? Is that even possible? I am confused. I have high myopia (-8.00 and -9.00) and I am 18 years old. Comments from a professional would be helpful. Thanks in advance.

[JohnHaganMD]

Arcing of light especially in the dark with rapid eye movement is normal for most people. So is floaters that have unusual shapes.  Avoid trauma to your eye and activities that whip your head around like amusement park rides. You have been well advised by your eye doctor. Be sure your "eye doctor" is an Eye MD ophthalmologist. Your eye situation is too complicated for an optometrist. Having a retina specialist also is ideal.