Ummm, It is likely glib to say, "do not use it"? Though that would be my immediate solution. I know that it may be hard, depending how one needs to use it? Repetitive strain injury is a serious matter. I would recommend that people consider switching from a laptop to a desktop and/or ipad or tablet. If the use of a computer is so necessary?
Recently, I read of people who now use an iPad as a cash register and whatever else they were needing it for in business, exclusively.
Repetitive strain injury is debilitating,for the immediate sufferer. Also, it will manifest itself later in life. When injury is harder to heal and overcome. I find eye-drops useful; even without the eye strain caused by staring at the screen. Exercise, like walking is so useful and healing, too. The gentle swing of our arms when walking eases tight neck and shoulder muscles and the toning of our bodies core section; through this action which is also our natural environment.
Ensuring that a good diet with the appropriate vitamins; for eyes, brain, nerves and bone structure. These are simple remedies that, if I suffered from the strain of constant laptop use? I would use. I already do.
Lastly, voice recognition is becoming a viable way of using desktop and laptop computers. This is a way for people with limitations around physical use of them and have been for some years now. I think it is what Stephen Hawking uses?