FFF,
Silvereagle is right, it is something i was taught to teach when i began instructing at night.
Show the student where the edge lights are to the side when on the runway. That way they know where they should be approx in the pheriphal vision, when landing, and looking at 'yon end.
It will give you the only bit of pheriphal vision you can get. More important if you dont have centreline lights, when you feel like you are in a black hole, and hence flare too high.