From how far away can a cobra see a moving person?

Generally a cobra can stike upto 1 to 6 feet,which depends upon how much feet it stands. Indian cobra,snouted cobra can stike upto 1-2feet while KING COBRA can strike

upto 6feets which cannot be balanced with any other snake.Other than that Black mamba can strike upto 3 feet & Long scaled viper (which is found Costa Rica rain forest) can strike nearly 4 feet even in upward direction.