I don't know if this product would be helpful to other people, but I've posted a link below for an automatic page turner for books. With this automatic page turner, books are held open hands-free and pages can be turned with the push of a button or with a sip-and-puff or foot pedal. For those who have trouble holding a book, keeping it open, and turning pages (even bookholders require frequent repositioning), this may be of some use. I have not tried this product myself but researched for one before I stopped working.
It looks like someone must adjust it every 20 pages read, but still, it does give some additional independence and allow books to be read where they can't. One of my friends has had to give up reading everything but electronic texts on the computer--she cannot afford a Kindle or books for it and cannot hold books or turn pages.