The effects of screen light filtering software on cognitive performance and sleep among night workers
Open accessAbstract
Background: Pervious studies have reported impaired performance, sleepiness and sleep deprivation among night workers. The purpose of this study was to investigate the effect of color Screen Light Filtering software on cognitive performance, alertness and sleep quality among night shift operators of a medical emergency operations center. Methods: This field trial interventional study was carried out among 30 nightshift operators of Shiraz emergency control center. The baseline assessments were carried out under the existing computer screen light conditions in the week preceding the installation of f.lux software. The same measurements were repeated again 4 weeks after installing the software. The cognitive performance of the participants was measured using continuous performance test (CPT) and n-back, while their sleep quality was assessed through Pietersburg Sleep Quality Index (PSQI). Further, to assess their subjective and objective alertness, Stanford sleepiness index and go/no go test were used, respectively. Results: The results of this study showed that Screen Light Filtering software significantly increased subjective (P < 0.001) and objective alertness (P < 0.05). Additionally, the performance of the working memory (P = 0.008) and sleep quality (P = 0.008) improved significantly after the intervention. Conclusion: The results revealed that using Screen Light Filtering software is an effective and low-cost method to improve sleep quality and cognitive performance since it filters the short wavelength part of the spectrum and helps body adaptation.
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Blue light filtering software can reduce some of the negative effects of evening short-wavelength light.
“some studies were able to show that blue light filtering software can indeed reduce some of the negative effects of evening short-wavelength light [43,44,45]”
From Preliminary Results: The Impact of Smartphone Use and Short-Wavelength Light during the Evening on Circadian Rhythm, Sleep and Alertness (2021) · cites this paper as [44]
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- Authors
- Kazemi, R., Alighanbari, N., & Zamanian, Z.
- Affiliations
- Shiraz University of Medical Sciences (IR)
- Corresponding author
- Kazemi, Reza
- Venue
- Health Promotion Perspectives
- Publisher
- Maad Rayan Publishing Company
- Published
- 2019-08-06
- Volume
- 9
- Issue
- 3
- Pages
- 233-240
- ISSN
- 2228-6497 (ISSN-L)
- PMC
- PMC6717920
- OpenAlex
- W2969164673
- Cited by
- 15
- References
- 39
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 4 · 2020: 1 · 2019: 1
- FWCI
- 2.65
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- cc-by
- Locations
- Health Promotion Perspectives (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Shiraz University of Medical Sciences
- Shiraz University
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Keywords
- night shift workers, cognitive performance, sleep quality, alertness, sleep deprivation, blue light exposure, working memory
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