So what exactly were Holloway's "eyeworms" then?

[Mustangjeff]

It's his new mega mutated trilobite sperm going for a swim... upstream.   

Its a good thing he didn't blow his nose.

[Huntsman]

The human body is full of Bacteria. Trillions and trillions of those little guys. The Black goo probably mutates them as well as human cells.

Yeah. I think it was to show that he was infected and the process of change was well underway.

[Alien³]

Sperm-o-morph.

[Local Trouble]

The white goo.

[Alien³]

[P-Rock]

Weren't they the same worms they found inside the derelict in one of the deleted scenes?

[MaximusGrandimus]

To me the slime that David picked up on his fingers in the tunnel, and was looking through, is like the slime which is seen in the other Alien movies.
He was not looking through the black goo at that moment imo.

In this point I have to disagree. When David moves the slime between his fingers, it seemed to have a reactive or self-conductive property. I always assumed it be some byproduct of the Engineers' seemingly bio-mechanical workings of the ship.

[SM]

Might be the same crap we see on Nu-Alien Vision (TM).

[Alionic]

The white goo.

[OpenMaw]

The human body is full of Bacteria. Trillions and trillions of those little guys. The Black goo probably mutates them as well as human cells.

[bb-15]

To me the slime that David picked up on his fingers in the tunnel, and was looking through, is like the slime which is seen in the other Alien movies.
He was not looking through the black goo at that moment imo.

In this point I have to disagree. When David moves the slime between his fingers, it seemed to have a reactive or self-conductive property. I always assumed it be some byproduct of the Engineers' seemingly bio-mechanical workings of the ship.

I think we can come to a point where what we both wrote can be consistent.
- With my statement about "the slime which is seen in the other Alien movies", I'll back off on that and can agree that in "Prometheus" this was unusual slime that David had between his fingers. (Sounds funny but that's the best way I can describe it.)   
- As you wrote; "the slime between his fingers, it seemed to have a reactive or self-conductive property."
OK, something is going on in the slime. It looks like something is alive in it.
- What I stand by is that the slime is not = to the black goo. So again as I wrote, David "was not looking through the black goo at that moment".