Abstract
When driving at night we drive - in spite of good eye sight - beyond the capacity of our eyes, if we continue to drive at a speed corresponding to daylight driving. The ophthalmologist is encountering the problem that with traffic space decreasing the speed driven increase. Originally our eyes are suited for "natural" motion such as walking or running, or natural dawning or dusk. In driving individual failures to perceive correctly the driver is not only required to perceive things but also to "evaluate" the impression received: moreover his eye must fulfil superior functions such as simultaneous perception and capacity for selection. In this context the limit of performance of our eyes is frequently transgressed.