![]() ![]() Thus, creating good illumination is very important to individual’s proper performance. If environmental conditions, especially illumination, cannot meet the individual’s performance requirements, it will reduce the quality of performance and lead to the occurrence of errors. Also, it was found in studies that inappropriate illumination increases the eye fatigue, decreases the performance, and eventually leads to an incident. The results of the studies show that proper illumination has a positive effect on individual’s performance and reduces the occurrence of accidents. Therefore, visual performance is very important for control-room operators. Because most of the activities in processing the data are done by human’s vision system. Illumination is one of the most important factors in performance. Conditions of work environment such as heat, sound and illumination have an important effect on people’s attitudes, behavior and performance. There are various environmental factors which can affect the operators’ performance in the control-room and lead to errors. Stringfellow (2010) also showed that 30 to 100% of industrial accidents were caused by human factor. ![]() Other studies conducted by Gatchpole et al.(2006) and Krikos and Baker (2007) also showed that human error was involved in most of the events of complex system. In Lowe’s study (2004), it was found that 64% of the accidents were because of human error. McCafferty (1995) stated that about 80% of the incidents include human error. According to various studies, human errors in complex industries and systems, such as chemical processes, power plants and nuclear power plants, are known as the main causes of accidents. Human error has long been considered as one of the most important factors in the occurrence of accidents. In these kinds of tasks, the control of a large difference and sometimes critical parts are taken by human element, and if users cannot process the data quickly and accurately, an error may occur which leads to the occurrence of great events. Human direct participation in the production process has diminished by human’s increasing progress in various fields, and instead, the role of the human factor in directing work systems through the control room has increased. The results of this study showed that increasing the intensity of light from the values below the allowable limit to the values above the allowable limit would increase the visual indicators in individuals. As to contrast, more lighting significantly reduced the percentage of recognized contrast ( p < 0.001) and increased the contrast performance index ( p < 0.001). Resultsīased on the results, visual performance index and visual acuity significantly increased after the intervention ( p < 0.001). It includes the first phase with fluorescent illumination system (Power: 40 W, Color Temperature: 4000 Kelvin, Luminous Flux: 2780 Lumen and Model: Pars Shahab) and the second phase with a combined illumination system includes fluorescent and LED (Power: 48 W, Color Temperature: 4000 Kelvin, Luminous Flux: 5400 Lumen and Model: Mazinoor). Sixteen operators in day shift were evaluated with the Freiburg Visual Acuity test (FrACT) software at two lighting systems with different intensities. Therefore, the aim of this study was to compare the control room operators’ visual performance in two different illumination conditions at a combined cycle power plant through field-work. Lighting is one of the environmental factors affecting the performance of the control room operators.
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