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Abstract
Abstract
Contrast Sensitivity under Glare Caused by Halogen versus Xenon Light Exposition: Evaluation of an Assessment Model
Schmitz S.1, Krummenauer F.2, Henn S.1, Dick H. B.1
1Dept. of Ophthalmology, 2Institute for Medical Biometry, Epidemiology and Informatics, Mainz University
Purpose: Xenon headlights become increasingly important in the car industry market. Until today it is not known if these headlights can cause differences to halogen light in contrast sensitivity at night driving conditions. In this study we developed a model to compare xenon versus halogen light at healthy subjects.
Method: After two minutes of dark adaptation the native contrast sensitivity was measured at 25 probationers using the CSV-1000 HGT (Vector Vision, Dayton, OH, USA). The instrument contains different contrast stages at four spatial frequencies (3, 6, 12 and 18 cycles per degree (cpd)). After this procedure the probationers were exposed to the halogen or xenon light of a car (SLK, Mercedes) at a surrounding illumination of 3 lux in randomised order (n=13, first halogen, then xenon light, n=12 and reverse), measuring the contrast sensitivity again under these circumstances. Descriptive analysis of contrast levels was based on medians and quartiles, the local significance of intraindividual differences in contrast levels after halogen and xenon exposition was evaluated using sign tests. A putative effect of the two expositions sequence was tested using the two sample Wilcoxon test.
Results: None of the glare