

Ok, that’s a paper that attempts to explain the feeling that a building might be haunted. There’s nothing in there about causing people to hallucinate. They talk about the supposed “resonant frequency of the eye”, but then they say:
The resonant frequency is the natural frequency of an object, the one at which it needs the minimum input of energy to vibrate. As you can see from above, any frequency above 8 Hz will have an effect and some sources quote 40Hz
If the values are that vague, then there is no resonant frequency. There may be frequencies that transmit vibrations to the eye, but with a big enough speaker you can cause anything to vibrate.
The closest the get to hallucinations is to say that "the eyeball would be vibrating which would cause a serious “smearing"of vision. It would not seem unreasonable to see dark shadowy forms caused by something as innocent as the corner of V.T.’s spectacles.” So, no hallucinations, just some blurry vision that might vaguely count as an excuse for seeing a ghost if your eye is vibrating significantly. Notice that that’s all just speculation, saying “this seems like it could be possible” rather than actually testing for that hypothesis.











Which can’t be explained by an unfocused eye. They do a lot of speculating to come up with a reason why he could possibly see something out of the corner of his eye. But, that’s only the physical part of it. It doesn’t explain why he might think that whatever he was seeing was “a figure” and moved like a person.
That’s like saying that ghosts can be explained by wearing glasses with dirty lenses, then going into detail about how dirty lenses can cause someone to see something that isn’t there, while ignoring the
elephantghost in the room. Except it’s even worse because a smudge on your glasses causing you to “see something that isn’t there” is really easy to test and barely needs an experiment to confirm it’s true. But, low frequency waves causing someone to see something that isn’t there isn’t something that has been tested. It’s pure speculation.So, pure speculation that low frequency waves can cause someone’s eyes to blur in such a way that the corner of their glasses is mistaken as something that isn’t there. No proof that has happened or can happen, just speculation.
Then ignoring the elephant in the room that just because someone might not see clearly if their eye is vibrating, that is somehow magically interpreted as a figure moving like a person, which they interpret as a ghost.
There’s a humongous jump there from “a certain frequency might cause the eyes to wiggle” to “and therefore that’s why he saw a ghost”.