Welcome to the forum Trish and the Hobby/sport. I think you will enjoy the AMA show, it is indeed a wonderful experience. I last attended two years ago.

While your concern on the depth percection thing is valid if you drive a car then you can overcome the problem with a good mentor I have worked with a number of folks with varous disabilitys and eyesight problems. The fellows who said the larger airplanes are an advantage are correct however the suggestion to color the left and right wings differently is a major mistake and this will have the effect of reducing the distance at which you can maintain orientation and is very confusing. Now making the top side of the wings and the bottom of the wings a different color (both wings) is a good idea and this will helo a lot.

Now on to airplane I believe There is only one airplane that would be the very best for you and that is the Senior Cadet from Sig manufacturing. This is a very large airplane for the engine sizes that it uses and has a span of eighty inchs a a very broad chord. It can be powered either by electric or glow engines however I prefer glow in most cases. I use one of these for most of my students and I even power it with an engine smaller than recommended which is a .35 and this is a combination that works superbly well for training.

Enjoy the show

John