By the time an image moves from the eye to the back of the brain it has been heavily processed, motion, shape, spacial aspects have been converted to a more generalized form of information. A highly focused beam could trigger individual neurons and give the individual a vision of type. That of motion, or depth. But to transmit a complete image would be very difficult and different for each individual. The best way is to introduce the image into the back of the eye, via scanning across the retina. But of course we do that naturally already.