[yomly]

Just on the note of hand strain, without knowing anything about your wife's condition, a way that could help alleviate it is to critically analyse hand position/technique. As a pianist, I have been trained to have a very supple hand position when operating any device but I notice this isn't at all the case for many people I observe in their day to day activities.

Historically probably wasn't much of an issue but given that most people will spend hours at a desk on a keyboard, it's likely to become more of a problem. Think of it akin to paying attention to your posture