For those in the US, With Her Eyes by Liu Cixin is currently free to download from Amazon (oddly enough, the book seems to be unavailable from other countries or, at least, from Spain). This is the synopsis:
He has an opportunity to travel and so he takes a pair of eyes along. In the future, those who cannot go on their own journeys can ask travelers to take electronic eyes along for them, offering another a virtual window to their experiences. Whose eyes is he carrying? And why is she insistent to the point of tears that he show her a sunrise?