PHD theses : Optics

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NROLE OF VISUAL PERFORMANCE IN ROAD
(Alneelain University, 2009) Ahmed Elsiddig Abd Elbagi Hamad
Abstract This study aimed to investigate relationship between vision and road accidents in Sudan highways considering visual performance of the drivers working along Khartoum — Maddani road. It also considers the visual requirement of the license approval. However the road conditions, rules and regulation of the trafﬁc would be looked at. The data collected by questionnaire distributed among 213 drivers taking their opinion about the road condition, driving difficulties facing them, causes of accidents and their suggestions for avoiding accidents. Clinical examinations were performed for 181 drivers at Khartoum land port. Functional tests included; refraction (automated refractometer), visual acuity (Log Mar), contrast sensitivity (Pelli Robson), visual ﬁeld (arc perimeter), stereopsis (Titmus test), colour vision (Ishahara plates), inner eye (direct ophthalmoscope) and outer eye examination (torch and magniﬁer). The results obtained showed that 42.2% of subjects had been involved in road accidents, (60.6%) were due to human factors, (45.5%) to road condition, (5.6%) caused by animals and (1.4%) result from vehicle failure. Results revealed that (26.8%) of the drivers complained of glare, (15%) of tearing, (12.7%) of blurring of vision while (9.9%) of them complained of sleeping during driving. I