The Tiresias family of fonts has been designed for use in multiple environments
to help improve legibility, especially for individuals with visual impairment.
It includes specialized fonts for information labels, control labels (for key
tops), large print publications, computer systems, television subtitling, and
signs.
The PCfont family is specialized for people with poor vision to use on PC
screens using large characters. The only difference between the PCfont and
the PCfont Z families is whether the zero is crossed out or not. In the
PCfont family, the zero is _not_ crossed out, which may lead to some
confusion.