I am a programmer and have been for over 20 years and I am starting to feel the effects of Carpal Tunnel Syndrome. I have always used the QWERTY style keyboard though I have often heard that the DVORAK style was better and more ergonomic. In doing research I found this site which claims:
Many people switch to Dvorak because it's more comfortable. The Dvorak layout was carefully adapted to fit the English language. QWERTY, on the other hand, is about as efficient as a random layout. Because it makes typing easier and more natural, Dvorak may actually decrease the risk of carpal-tunnel syndrome and other forms of repetitive-stress injury (RSI). You can type longer on Dvorak without making your fingers sore. In fact, most RSI sufferers no longer feel pain in their fingers after switching to Dvorak. If you experience pain from using the QWERTY keyboard, the Dvorak layout is for you.
Is there any evidence to back these claims up. When I search the internet I see several people who have decided through their anecdotal experience that they did not think so. Is there any actual evidence one way or the other?