The relationship between the extent of visual field and driving performance--a review.

The effect of the extent of visual field upon driving performance has recently received a great deal of interest. With such a volume of traffic on the roads today, peripheral vision would seem to be essential for safe driving and yet past literature is inconclusive as to the relationship between the extent of visual field and driving performance. This paper reviews the research work and gives possible reasons for the lack of relationship reported in most of the studies. Until further research work does determine the minimum visual field required for safe driving, the role of the medical practitioner in advising patients when they are considered unsafe to drive is in question. The provision of a period of adaptation after complete loss of vision in a previously normal eye should also be considered, during which time the motorist is temporarily banned from driving.