displays. Size of characters, aspect ratio, font, stroke width, color of character, background color, and coding all contribute to reading speed and error rate.
The standard viewing distance for displays is assumed to be 28in from the display to the eye, and recommended dimensions for characters and display elements are based on that distance. For other distances, characters and elements should be adjusted in size. One formula for sizing the height of letters, H, is
H=0.0022D+K1 +K2,