Characteristics of the Eye with Special Reference to Road Lighting

Fo llowing a brief discussion' on the way in which objects' are seen on nrtif'icially-ilhuninated highways, the circumstances in which the eye is likely to fail are studied. The efficient or imperfect functioning of the eye is detérmined mainly by the visual acuity, the contrast sensihility, the richness of contrast and the speed of vision. The interconnection of these phenomena is discussed in reference to the following characteristics of the eye: Accommodation, 'diameter of pupil, chromatic and spherical aberration, astigmutism, adaptation, glare and the Pur kin j e phenomenon.