I got an interesting response from one of the technicians who make the Paraliminal CDs that I have been listening to. I've attached his response to my e-mail last night about the double vision here. I think his answer seems a bit hokey, but I'll go with the simple explanation that perhaps the double vision is coming from me expanding the scope of my peripheral vision for whatever reason I might want to do this [for what reason I do not know]. As a result, my focus (at least now in the beginning stages) is getting thrown out of order while I adjust. Who knows.
Added May 21st: I received two more e-mails from the same e-mail I sent to the three companies whose CDs I use for brain entrainment. I particularly enjoyed (and agree with) the explanation given to me by Centerpointe's staff, namely that what I am experiencing is sensory overload which will eventually force the brain to function at a higher level or burn out. Their e-mail is here.
Interestingly enough, Centerpointe's system is VERY expensive so I only have the first part (of I think seven) of their system. The Paraliminal CDs also have a licence to incorporate Centerpointe's technology into their system of which I own the whole thing.
*CORRECTED 1/11/2010* Monroe Institute is the owner of the Hemi-Sync technology which in my opinion has been knocked-off (and possibly improved, although I can't be sure) by the Centerpointe's Holosync technology. While they both do the same thing, Monroe's products are geared towards achieving various out of body experiences among other claims which do not pass muster with my hokey test. However, I find their progression from one brain state to another a step up from Holosync and so I purchased their full product. However, I would say that their response to my e-mail about having double vision is tragic and overly cautious; I've attached their response here.
While I can respect erroring on the side of caution, I felt that that the response from Monroe Institute was less than professional. If they are selling a product that incorporates the brain entrainment technology, they should know how to handle questions from customers when the product begins to work.