This paper describes a method for quantifying the binocular image disparity in aspherical mirrors. The method involves measuring images in the mirror in angular degrees with respect to the driver's eye. Binocular image disparity is defined as the percent change in angular image size seen by the driver's right eye versus left eye. Four types of targets were used to measure disparity: vertical linear and horizontal linear (one dimensional) targets, area (two dimensional) targets, and volume (three dimensional) targets. Three eye to target distances were analyzed: 2000 mm, 4000 mm, and 6000 mm. Four aspherical mirrors were analyzed. The method characterizes aspherical mirrors in terms of the maximum binocular image disparity and the maximum rate of change in binocular image disparity. Binocular image disparity was largely unaffected by target distance. The square area target was recommended over the other target types. (A)
Samenvatting