Abstract
Through the use of aspheric outside rear- view mirrors, the lateral field of vision by passenger cars, compared with that afforded by the usual plane mirror, is expanded essentially up to 300% so that the blind area is eliminated. Tests of drivers of passenger cars which have been fitted serially with aspheric mirrors for many years show that the effort necessary for adaptation to the changed characteristics of the figures in the mirror is over compensated by the enormous gain in the field of vision, and thus a gain for driving safety.