For millennia, the practice of meditation has been deeply intertwined with many of the world's major and minor religious and spiritual traditions, as a technique aimed as everything from developing magical powers to communing with gods and demons. By contrast, during the last few decades in the West, enthusiasts have promoted meditation (along with a variety of its secularized offshoots) as a good way to cultivate relaxation, creativity, and psychological self-improvement in the context of our hurried and stressful lives. Because of this variegated cultural history, it's no surprise that many people see it as either as an exercise that leads to irrationality and madness, or as a harmless but questionably-effective pop... (read 4855 more words →)
The first paragraph isn't about vibrations. That's just visual junk. Looking at it closely will make vibrations apparent.
The second paragraph sounds like it's about vibrations. The rapidly-changing graininess is overlaid by another pulse, yes? How do you know that it's a pulse, unless you can almost-sort of see the fluctuation from "nothing" to "something" to "nothing"? (In stage 2 the "something" is clearest, so don't expect the "nothing" to be overwhelming.)
If you can't label "pulse" or "seeing" fast enough, try "that." If you still can't do it fast enough, simply see the vibrations without being distracted, or count them. Balance just seeing with labeling if distraction is a problem. Re-read my stage 2 advice in the post.
I'll be away for a few days, starting now, so you're on your own for awhile. Sounds like you'll be fine.