Legibility of symbols on CRT displays.

The effects of several parameters - such as letter orientation, slanting versus upright, dot matrix size, etc - of symbol formation on the legibility of CRT displays were studied. Symbols were tested by subjects attempting to identify them when presented briefly on the display screen. Speed and accuracy of identification were used as the measures of legibility. The 7 x 9 dot matrix symbols drawn with circular dots were superior to all others for both reaction time and errors. Slanting had a detrimental effect on dot and stroke symbols and circular dot symbols were superior to elongated dot symbols.