Discorde I would say on a hard runways the edges in your peripheral vision are the cue to flare, as when landing on grass, after using a hard runway for sometime most people flare to low on grass and bounce, as no edge cues. That's why I think a high seat setting and looking at the end of the runway are important plus noting visual cues each side. An instructor flying you down the runway in ground effect is a good exercise to learn these cues.