The ocular motor module (OMM), a video-based image processing computer system, generates visual stimuli for testing ocular motor and pupil function. Subjects (Ss) look into a foam-lined viewport, which excludes all ambient light and allows testing in total darkness. Non-visible infrared light-emitting diodes, to which the video cameras are sensitive, provide images for the computer system. The OMM samples at a rate of 60 samples per second. Stored data is available for analysis using feature extraction algorithms. An alcohol-impairment test protocol is based on tests used in Standardized Field Sobriety Tests and Drug Recognition Evaluations. Measures include nystagmus, smooth pursuit, pupil size smooth pursuit, pupil size in darkness, and pupil response to dim light (approximately 8 foot candles) and bright light (approximately 20 foot candles). Alcohol effects on eye performance were examined with 32 Ss dosed to 0.08 percent BAC. They were tested predose, at peak BAC, and on the descending BAC curve. Pre- post-dose comparisons are displayed in tables and figures and demonstrate the effects of alcohol on eye signs. (A)
Samenvatting