Gupta, S. M., Geyer, L. H., & Maalouf, J. A. (1983). Effect
of font and medium on recognition/confusion. Proceedings
of the SIGCHI conference on Human Factors in Computing
Experimenters examined errors and confusion matrices from
different fonts. Stimuli were displayed at a vertical
visual angle of 1 degree at 8 feet. Duration and luminosity
were adjusted for each individual to achieve approximately
50% correct identification for each font.
The 26 uppercase letters, either in a dot-matrix font, or
the stroked "Keepsake" font. Figure
1 from the article, reproduced below, shows the letters and font used.