Bichão I C, Yager D, Meng J
State College of Optometry, State University of New York, New York 10010, USA.
J Opt Soc Am A Opt Image Sci Vis. 1995 Oct;12(10):2252-8. doi: 10.1364/josaa.12.002252.
One of the main early complaints of cataract patients, even when these patients exhibit only mild glare problems as measured by standard tests, is that glare impairs their night driving. To provide a better measure of the patients' impairment, glare tests should include measurements of the glare effect in conditions more similar to those found in night driving. During night driving the ambient light is very low, and oncoming headlights present a transient temporal pattern. Furthermore, the objects of interest often appear initially in the peripheral visual field. Thus three important characteristics of glare in night driving are that the ambient illuminance is in the scotopic-mesopic range, the detection stimulus is in the periphery, and the glare source is transient. Most of the current glare testers measure glare only at photopic levels, and all the glare tests that we know of use only steady sources of glare with foveal discriminations. All these conditions are dealt with. The transient glare source raised thresholds by 0.5-0.75 log unit more than the steady glare source, and the transient glare effect was more pronounced and more long lasting in the periphery. Standard glare testers seriously underestimate disability glare effects in everyday life.
白内障患者早期的主要抱怨之一是，即使这些患者在标准测试中仅表现出轻微的眩光问题，眩光也会影响他们夜间驾驶。为了更好地衡量患者的损伤程度，眩光测试应包括在更类似于夜间驾驶的条件下测量眩光效果。夜间驾驶时，环境光非常低，迎面而来的汽车前灯会呈现出瞬态的时间模式。此外，感兴趣的物体通常最初出现在周边视野中。因此，夜间驾驶中眩光的三个重要特征是环境照度处于暗视-中间视觉范围内、检测刺激位于周边、眩光光源是瞬态的。目前大多数眩光测试仪仅在明视水平下测量眩光，而且我们所知的所有眩光测试都只使用稳定的眩光光源且进行中央凹辨别。所有这些情况都得到了处理。瞬态眩光光源比稳定眩光光源使阈值提高了0.5 - 0.75对数单位，并且瞬态眩光效果在周边更明显且持续时间更长。标准眩光测试仪严重低估了日常生活中的失能眩光效果。
