I am blind in one eye and have 20-200 in the other(corrected to 20-20) I taught myself this: a bright plane I am looking at the top, a dark one I am looking at the bottom. It is more complicated than that but it helped in the beginning. I try to never fly if the sun is in front of me and below the level of the airplane, it is always a silhouette then. The problem I had was that the planes do lose color at a distace, and without depth perception I couldn't tell if a plane was getting closer or farther away. I would pull up elevator thinking the plane would turn toward me and it would go the opposite way. Now if I can't tell I just bank the wings Until they are bright and give up elevator. It is always good to use small corrections in case the plane got inverted. It has been a few years since I taught myself this so I do it subconsiously and don't know if I am saying it right.

Here is a video I posted a while back of a Dynaflight Butterfly I had. It was totally black(looked like it was covered with a garbage bag). If you look at about the 40 second mark I come in low in front of some trees-black on black. But you can still tell that the plane is banked toward you, because it is bright. and at the 1:15 mark on my landing approach my nephew who has two eyes thinks the plane is going away. I had no trouble with it, since I knew what to look for, but with the quality of the video I don't know if you can see it.

[link]http://www.rcuvideos.com/video/GMS-32-on-a-Butterfly-vs-This[/link]

If you can teach yourself what I did it dosen't matter the color of the plane.I don't know if this will help but it did me.-BW