Just to add to what has been said, those lights are part of what is called 'the runway environment.' I've never been confused by them on an approach. In fact, there have been times when I've wanted more of them. For example, I was approaching PVU runway 36 at night. the winds favored that runway, but there was still a bit of a crosswind component. The runway only had the green endlights, and the white edge lights. Needless to say, the approach was 'exciting,' and I would have been very grateful for a VASI. This was back in 1995, and I still remember it. I know PVU has changed since then, and they may have added a VASI on that runway - in fact, let me check... Checked AOPA's online directory and couldn't figure it out, and I don't have my Flight Guide right with me, so I can't say conclusively. I've never flown anything bigger than a Piper Archer, so I don't know how it is in larger aircraft. But when you flare a smaller airplane, all you can see is the runway edge lights going by in your side windows. It makes it pretty hard to judge how high you are above the ground, so you can't really tell how hard to pull back on the yoke. So when you are learning night landings, you can have some really rough landings. Heaven know's that I've had my share.