Here are parts of the print-outs from having the bone behind my ears zapped two weeks ago. Luke explained it to me today. The image on th eleft of the post shows the response of the left eye. The image on the right side of the post shows the response of the right eye. Each image is composed of three small graphs (going down the screen).
This is the 'torsion' part of the test, ie the ability of my eye/brain/inner ear to follow an extreme jolt to the head. The other measures were in the vertical plane and the horizontal plane. They tended to mirror what is apparent here. These graphs show the residual balance. Balance is more impacted on the left than on the right. Specifically, it is measuring the torsional vestibulo-ocular reflex.
The first graph shows the absolute movement of the left eye is from zero to 0.00025. for a 'normal' person under this stimulus, the movement would be from zero to anything up to 00.010. Remembering that the right graph is the mirror reverse (read it upsidedown) it is stronger.
The second graph shows the movement of the eye after the stimulus. Pretty much a squiggle, close to extinguishment. Once again a 'normal' eye would show a wave from zero right up to 10 a couple of squiggles, flatline along the box, then drop right down to well below the box, almost to the -5.0 marker before returning to the zero point. As you can see, the right graph shows a similar though less marked impact, meaning the balance is not AS extinguished.
Using some sort of physics equation to translate the above two graphs, the bottom graph shows the eye movement in mph. A normal (sick of putting the quotes, you know what I mean) eye would show a massive wave up to 2000 and then immediately down to 2000, scarper along to the end of the box then another wave of similar magnitude.
So what does it all portend? If my balance was degrading at an equal rate on each side, the effects may not (may not) be as noticeable. The figures I returned surprised him because he cannot see the impact on me that he has seen on other subjects. Meaning that I am compensating to a very large extent; learning to live with it. I have just done a questionnaire showing my subjective response to this hassle I am having. He expects me to score low, which I think I have done. The questions ask about physical impacts and psychological impacts. I scored 40 out of a total of 100.
So, how long before I flat-line. Probably somewhere between 24 and 36 months. Which surprised me. I had given myself 10 years. However ... however ...
Flat-lining does not mean I fall over. I can flat-line on BOTH sides but if I have compensated, I will still be upright. Ginger maybe ... THis is why I must remain skinny AND I must remain active. I must keep on getting out and about and forcing my eyes and my legs to work together. Eventually I will not be able to walk and read signs as they will jiggle too much. Well Gerry Ford could not walk and chew gum!
It is not only the accommodations that I have made, though. There are two gravity sensors in the inner ear that are not impacted by this problem which emanates from the cerebellum. Only the otolithic receptors are damaged. Hence, I can effectively measure a balance of zero on both sides and still be upright.