It's not affected at all. Geometry and convergence are big problems,
but the yoke takes care of most of that. Of course on these cheap
flat CRTs it's not an issue because they are as curved as a regular
CRT on the inside.

As best I can tell by looking closely from the outside, the CRT appears to
be *almost* flat but I do agree it seems to have a *slight* curve. In other
words, as best I can tell, the surface of the CRT does not seem to be nearly
as curved as a "classic" standard CRT.

J.