Almost all of the information required to drive a vehicle is obtained through the eyes. Instruments convey information on vehicle conditions and their visibility is of primary importance. A study is conducted on two aspects of visibility in vehicles.
Experiments are conducted to analyze quantitatively the effects of display parameters, environment, and age on the above factors in order to produce instrumentation which is easy for older drivers to read. The parameters chosen are display brightness, character size, distance between the eye and display, and location of the display. The subjects are separated into two groups, one in their twenties and the other in their fifties. All have visual acuity of 0.7 or above. Each test run consists of a 20 min. adaptation time followed by the visual task. A Landolt's Ring is used as the display character and subjects are asked to indicate whether the Landolt Rings opens to the left or right by operating a hand-held two-way switch.