The question assumes you only look in one place and doesn't take into account any peripheral vision or even aircraft type where different visual effects may be encountered.
Until the flare the touchdown point should be your focus. At this point you shift to the far end of the runway/horizon direction and attitude reference. You should also be able to feel in your peripheral vision the runway edge markings and the runway itself.
I trust it goes without saying that the throttle is closed and that the aircraft is trimmed correctly to the proper speed.
If all these things are in order you can just close your eyes and wait...there's only one way to go!