Yeah those look like crystal worms to me. Are the black spots on them pivots where the parts of the floaters rotate on these?

I was also wondering is you can see those on a PC screen? I am puzzled lately by 2 friends who told me they can see their floaters only outside when it's very bright sunlight but not on the pc screen which I wonder how it can be possible? Sure sunlight is way more bright but pc screen are bright nowadays with lcd and led's and they are pure white a lot in windows.

I know my crystal worm always was visible on both outside and pc screen.