Does anyone have experience with these lenses, which are made by Gelfax
Labs in Australia?  They reportedly have FDA approval and "allow for
the incorporation of patients' complete prescription, including the
precise astigmatism correction," thereby providing "optimal visual
clarity for both distance and near, without compromise."  They're also
said to be extremely comfortable.  I've tried wearing several brands of
concentric-design bifocal/multifocal lenses without success, but these
lenses seem to be different.