[davidm]

Quite the contrary, a world in which instantaneous seeing were possible would be so radically different from our own that it's doubtful it could have sentient observers at all. In such a world, the theory of relativity would be false, E=MC2 would be a false equation and there would be no atomic energy. Moreover, in such a world, there would be no night sky! It would be completely white (see Obler's Paradox). Many other consequences can be deduced as well. Life as we know it could not exist.