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Showing 3 results for Visual Comfort
Study of Daytime Lighting at Official Rooms and Its Relation with Personnel's Cognitive Performance, Alertness, Visual Comfort and Sleep Quality
Reza Shahidi, Rostam Golmohammadi, Zahra Pirmoradi Rizevandi, Azar Soltani, Nassrin Shirmohammadi Khoram, Reza Kazemi,
Volume 8, Issue 1 (5-2020)
Abstract

Background and Aim: Undesirable lighting at work environment causes visual and non-visual effects on employers. The aim of this study was to compare the quantity and quality of combined and artificial lighting in daytime and its relationship with the indexes of mental performance.
Methods: This study was carried out at 65 rooms and on 81 employees randomly selected from different clusters. Measurement of lighting parameters was done using a spectrometer. To assess the cognitive function, the Pshycomotor Vigiliance Task (PVT) test and for the sake of visual comfort, alertness and sleep quality, the Conlone, KSS (Karolinska Sleepiness Scale) and PSQI (Pittsburgh Sleep Quality Index) questionnaires were used respectively.
Results: Most artificial sources used in the rooms included fluorescent lights in different shapes and colors. The average indexes of combined lighting was more than artificial lightings (P<0.001). Visual comfort was correlated with high color temperature (P=0.006, r = 0.315). The employees with natural lighting had less visually impairment. The sleep quality of the subjects was related to the type of work environment lighting (Chi2=0.59, P=0.44). Alertness of subjects exposed to high color temperature or natural light was better at 8 and 11 hours. The results of cognitive performance test showed no significant difference between different lighting conditions.
Conclusion: Using natural light or artificial lights with adequate illuminance and high correlated color temperature can increase the alertness and visual comfort to some extent and improve the sleep quality of day staff employers.


Design and Development of a Visual Comfort Questionnaire (VCQ) for Employees in the Workplace
Mostafa Rahmiani Iranshahi, Masoud Shafiee Motlagh, Elahe Dortaj, Maryam Farhadian,
Volume 9, Issue 4 (3-2022)
Abstract
Background and Objectives: Visual comfort is an important and influential factor on safety, mental health, sleep quality, and musculoskeletal disorders of employees in the workplace. This study aimed to design and develop a questionnaire to assess the visual comfort of employees in the workplace.
Methods: The study was performed on 101 participants (88 men and13 women) in the food industry. First, the available lighting questionnaires in the field of lighting were reviewed, and a question bank was set up. Twenty questions were considered in two sections of natural and artificial lighting (10 questions in each section) based on the opinion of 10 experts in this field. The validity of the questionnaire was assessed using the content validity index (CVI) based on the comments of experts. To validate the questionnaire in the workplace, The lighting of employees' workstations was evaluated according to the Illuminating Engineering Society of North America (IESNA) standards and compared with the results of the questionnaire.
Results: The Cronbach's alpha of natural and artificial lighting visual comfort questionnaire was 0.858 and 0.922, respectively. The total CVI of the questionnaire was 1. There was a significant positive relationship between the score of the visual comfort questionnaire and the workstations' illumination (P = 0.001). More than 97% of employees who had workstations with the desired lighting reported excellent levels of visual comfort.
Conclusion: The visual comfort questionnaire had good and acceptable reliability and validity. This tool is recommended for the use of visual comfort asessments of employees in work environments given the fewer number of and simplicity of sentences.

Factors affecting visual comfort: A systematic review
Payam Heydari, Avin Ahmadian, Aram Mohamadi, Pakhshan Ahmadian, Seyyed Ehsan Samaei,
Volume 13, Issue 1 (5-2025)
Abstract
Introduction: Today, visual comfort is considered an important and fundamental component of man-made environments. Therefore, it is necessary to pay special attention to all factors affecting it. This study was conducted as a systematic review to summarize the factors affecting visual comfort.
Methods: An electronic search was conducted in national and international databases including Web of Science, Scopus, Google Scholar, Medline, PubMed, Wiley Online Library, BMJ Learning, Springer and ProQuest. Articles were searched using keywords such as visual comfort, architectural features, space configuration, interior design, physical factors, and lighting.
Results: Out of 135 articles, the full text of 19 articles was finally reviewed. Questionnaires were used in 53.5% of studies, while device measurement were used in 21.4%. Physical factors were found to have the most impact on visual comfort, accounting for 51.4% of the studies reviewed. Additionally, architectural factors, space configuration and interior design accounted for 25.7% of the impact on visual comfort in the studies reviewed.
Discussion and Conclusion: Improving visual comfort can be achieved by influencing factors such as physical elements, architectural design, space configuration, and interior design. This can lead to a reduction in errors, improved performance, decreased injuries from falls, and an overall increase in quality of life.

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