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I'm a 49/14 PWD. 3 years ago I started making of my sick body a subject under observation. If I had to build some kind of very robust robot, I would choose solutions as simple as possible. I would build each function independently of the other ones and be sure it is working properly before assembling my robot and linking all these independent functions with a very powerful neural network. Then, in my robot, the eyes are built in order to be able to give to the CNS the visual information that is needed. Focus tuning and rotation of the eyes are controlled by muscles. In principle, these muscles have to work independently of what the other muscles of the head are doing. Among the other muscles of the head we find those that are in charge of the motion of the head with respect to the rest of the body. This class of muscles if very concerned with postural control. And this function is very often altered by P.D " Postural Control in Parkinson's Disease S.L. Mitchell*, J.J. Collins, C.J. De Luca and L.A. Lipsitz ///C|/NETSCAPE/posture.htm " The state of these muscles is far from standard and they can mechanically interfere with eye control. CNS knows there is something wrong but it is very difficult for it not to feel that the eyes are not working properly. In fact the viewing device can be in a good shape but the muscular functions it depends on can't work properly. It is the same for a lot of Autonomic System functions that mechanically interfere with postural control. This obvious (for me, it is) mechanical interference, has to be added to the very large level of noise that affect proprioception signals. I'll write on this last subject later. MEG