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To veer somewhat off-topic, I'm one of those people who have trouble using mice for longer than an hour or so. I have had tendonitis in both wrists, and my primary trigger is the sustained side-to-side wrist movements like you get using a mouse or an iron (which is why I no longer iron clothing except on rare occasions). The other trigger is vibration - I managed to trigger an attack earlier this year using a pressure washer to clean my driveway.
As a result, I use trackballs and an ultra-thin keyboard - this arrangement keeps my hands spread out and my wrists and hands are held like this: _ _ not like this: _ /. I also had minor problems when I got my iPad, but once I sourced a cover with handstrap, I was OK.
So if people say reading on an LCD screen for long periods gives them headaches and/or eye trouble, then my response would be to ask when was the last time they had their eyes tested? Being short sighted, I've always had my eyes tested annually even if I had to pay. I don't now as I was diagnosed with diabetes about 3 years ago now (so my eye tests and prescriptions are free), but previously my employer paid as my job involved long periods using computers.
Come to think of it, I used to get noon headaches on sunny days especially in the summer - I've been wearing spectacles since I was 11 (and almost certainly needed them long before that). That sounds a bit like the LCD issue; and the optician prescribed tinted lenses. No further problems with headaches.
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