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> Such designs reduce the trackball to something that can be manipulated only with a thumb rather than two fingers (index and middle). Such designs are unappealing and too restrictive to me.

Interesting. Does that mean that with the kind of trackball you describe you'd have to move your whole wrist to move the ball left and right? I find I have very little lateral mobility in my index finger and practically none in my middle. Isn't that tiring after a while?

I often use an MX Ergo (which is a "trackball mouse" — thumb operated — and is my only trackball experience) and what I like about it is that my wrist can have a fairly natural position and I don't have to move it around or hold it suspended.




> Does that mean that with the kind of trackball you describe you'd have to move your whole wrist to move the ball left and right?

The trackball is fairly large, about 5.5 centimeters in diameter. So I personally use mostly finger movements with slight flicks of the wrist. However, the ball is so large one could keep one’s wrist rigid and use both shoulder and elbow to move it.

It really is a very comfortable device.




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