Cliff Ober wrote:
> Tim,
>
> I used the Logitech mouse until they introduced their first trackball; I
> used that until they introduced the Marble. That's what I used until I was
> physically unable to function with it any more and moved to the pen/tablet.
> I'd dispute any claim that the Marble eliminates CTS.
>
> Cliff
>
> -----Original Message-----
> From: Tim Hutcheson [mailto:[EMAIL PROTECTED]]
> Sent: Saturday, June 02, 2001 8:32 AM
> To: Protel EDA Forum
> Subject: Re: [PEDA] Suggestions for a user with a cast on his right
> hand.
>
> Cliff,
>
> I find that the Trackman Marble, which lifts the ball and allows the thumb
> to fall naturally to the switch with the index and forefinger rolling the
> ball at a somewhat vertical angle, completely eliminates the CTS associated
> with horizontal trackball movements. And it eliminates the tension in the
> right shoulder as well. A lot depends on how much of cast he has though.
> Have to be able to move you fingers, at least. :o)
I'm not using this particular model, but I regularly use 3 different
trackballs
on 3 systems. I do a lot of CAD work, which requires fine pointing, down to
just about single pixels on a 1024 x 768 screen. If I use a mouse, I tend to
get a "death grip" on the thing, so that it doesn't move the cursor when I
click a button. This definitely causes sore muscles and triggers something
that I self-diagnosed as CTS. It might not be, but it WAS painful and lasted
for almost a week. The trackballs leave the cursor where you put it when you
click buttons, and their general mode of use doesn't give you anything to
get a grip on, so your hand stays more relaxed. With one particular
trackball,
I still had a little trouble, and cut a piece of soft foam to rest the heel of
my
hand on, and that works real well. I have worn out the button switches on
that one, and had to replace them!
So, at least for me, and the work I do, I find that a trackball is a BIG help
in
not causing ergonomic problems.
Jon
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