These files will NOT fit your glasses (unless you happen to have the same frames), but here's how it was done.

# Trace your glasses frame onto a piece of paper.
# Scan the tracing; import into your editor of choice (in this case, inkscape)
# Make sure your editor DPI matches your scan (inkscape defaults to 90dpi).
# Using the path tool, trace the frame; just trace one lens, as you can mirror image it later.
# Export the path to openscad.
# In openscad, you'll now need to: make the cutout, mirror it, and figure out the spacing.
# Print it thinly (height=1mm) with 0 extra shells, to make sure it aligns with your glasses.
# Add the posts, and print it in black!
# Deconstruct the 3D glasses from the theater and glue the film to your print; trim the excess after the glue dries. (If you're smart, you'll do one side at a time, and make sure the film is aligned/facing correctly.)

These might be more comfortable, but the movies may still give you a headache...