There is something called eye relief, which is the max distance a person's eye can be from the optic while still getting the full view. Optics for powerful rifles have long eye reliefs to protect the eye and bones around the eye.
Using a digital sensor to capture the optic's output and then using a screen to display it is possible. In fact you could fully robotise the rifle for remote operation. Such machine guns and sniper rifles were used a lot in the Syrian Civil War. Remote controlled weapon stations we see commonly nowadays are also technically robotized rifles.
