近光视觉截止线的精确客观定义是必要的，因为 所有现有规范中都规定了这些光束的正确对准要求 规定。目前，在欧洲和欧洲，近光前照灯的瞄准是通过视觉进行的 美国（自1997年起），在光束模式中使用截止线。 需要对视觉截止线进行良好的定义，以确保图像的一致性 解释。本报告对近光视觉截止的研究进行了综述 已在欧洲和北美实施。 基于这些研究，一个 建议定义和测量一个标准的截止线 通过光度测量的近光前照灯。该出版物以英文写成，并附有法文和德文的简短摘要。它由19页6位数字组成。

A precise objective definition of low-beam visual cut-off is necessary, since a requirement for correct aiming of these beams is specified within all the existing regulations.At present, aiming of low-beam headlamps is performed visually in Europe and USA (since 1997), using the cut-off line in the beam pattern. A good definition of a visual cut-off is required to allow uniformity in interpretations.This report provides a survey of studies into low beam visual cut-off that have been carried out in Europe and North America. Based on these studies, a recommendation is made for the definition and measurement of the cut-off line of a low-beam headlamp by photometric means.The publication is written in English, with a short summary in French and German. It consists of 19 pages with 6 figures.