head JofIMAB
Journal of IMAB - Annual Proceeding (Scientific Papers)
Publisher: Peytchinski Publishing Ltd.
ISSN: 1312-773X (Online)
Issue: 2021, vol. 27, issue2
Subject Area: Medicine
DOI: 10.5272/jimab.2021272.3823
Published online: 29 June 2021

Original article

J of IMAB. 2021 Apr-Jun;27(2):3823-3825
Panayot N. NikolovORCID logo Corresponding Autoremail,
Department of Hygiene and Epidemiology, Faculty of Public Health, Medical University Varna, Bulgaria.

Computer vision syndrome (CVS) is a combination of eye and vision problems associated with the use of digital devices. CVS affects the eyesight, visual comfort and occupational productivity of workers due to the different symptoms computer users and staff experience: ocular discomfort, headache, dry eye, blurred vision etc.
 Aim of the study: To assess the symptoms of CVS in a software company in Varna by subjective and objective tests and prescribe measures for prevention.
Materials and methods: 40 participants-31 men and 9 women were distributed with a valid questionnaire regarding common symptoms of CVS. The group was tested with the Schirmer test to measure the tear film quantity. Participants have passed a medical exam by an ophthalmologist before the study.
- 11 or 27,5% of the participants in the questionnaire have reached  score ≥6 – have CVS
- 10 or 25 % of the participants in the Schirmer test  have reached results < 5mm. in the tear strip
- The gender distribution shows 3 women (33.33%) and 8(25.8%) of men have CVS by questionnaire study and 3(33.33%) of women and 7(22.6%) of men based on Schirmer test have dry eye as asymptom of CVS.
Conclusion: The results of the study predispose to further evaluation and tracking of the symptoms of CVS among this occupational group. All of the participants are aware of Ordinance № 7 related to health and safety work conditions with VDT’s and received information regarding the physiological work-rest regime. Occupational risk of CVS  can be reduced with early diagnose, assessment and prevention of the symptoms.

Keywords: CVS, occupation, digital device, assessment, digital eyestrain,

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Please cite this article as: Nikolov PN. Computer vision syndrome: Review and methods for assessment. J of IMAB. 2021 Apr-Jun;27(2):3823-3825. DOI: 10.5272/jimab.2021272.3823

Corresponding AutorCorrespondence to: Panayot Nikolov, Department of Hygiene and Epidemiology, Faculty of Public Health, Medical University – Varna; 55, Marin Drinov Str., 9000, Varna, Bulgaria; E-mail: panayotnikolov04@gmail.com

1. Rosenfield M. Computer vision syndrome: a review of ocular causes and potential treatments. Ophthalmic Physiol Opt. 2011 Sep;31(5):502-15. [PubMed]
2. Bhanderi DJ, Choudhary S, Doshi VG. A community-based study of asthenopia in computer operators. Indian J Ophthalmol. 2008 Jan-Feb;56(1):51-5. [PubMed]
3. Travers PH, Stanton BA. Office workers and video display terminals: physical, psychological and ergonomic factors. AAOHN J. 2002 Nov;50(11):489-93. [PubMed]
4. Rosenfield M, Li RT, Kirsch NT. A double-blind test of blue-blocking filters on symptoms of digital eye strain. Work. 2020;65(2):343-348. [PubMed]
5. Larese Filon F, Drusian A, Ronchese F, Negro C. Video Display Operator Complaints: A 10-Year Follow-Up of Visual Fatigue and Refractive Disorders. Int J Environ Res Public Health. 2019 Jul 13;16(14):2501. [PubMed]
6. Chu C, Rosenfield M, Portello JK, Benzoni JA, Collier JD. A comparison of symptoms after viewing text on a computer screen and hardcopy. Ophthalmic Physiol Opt. 2011 Jan;31(1):29-32. [PubMed]
7. Coles-Brennan C, Sulley A, Young G. Management of digital eye strain. Clin Exp Optom.  2019 Jan;102(1):18-29. [PubMed
8. Seguí Mdel M, Cabrero-García J, Crespo A, Verdú J, Ronda E. A reliable and valid questionnaire was developed to measure computer vision syndrome at the workplace. J Clin Epidemiol. 2015 Jun;68(6):662-73. [PubMed]
9. Ordinance No.7 – 15 August 2005 . Minimal requirements for ensuring health and safety labor conditions during work with video display terminals (VDT’s). Bulgarian Ministry of  Health. Bulgarian Ministry of labor and social politics. (in Bulgarian)
10. Dimitrova T, Zlatarova Z. Work with video display terminals and refraction abnormalities. Scripta Scientific Medica. 2009; 41(1):45-47.
11.Thorud HM, Helland M, Aarås A, Kvikstad TM, Lindberg LG, Horgen G. Eye-related pain induced by visually demanding computer work. Optom Vis Sci. 2012 Apr;89(4):E452-64. [PubMed]
12. Heus P, Verbeek JH, Tikka C. Optical correction of refractive error for preventing and treating eye symptoms in computer users. Cochrane Database Syst Rev. 2018 Apr 10;4(4):CD009877. [PubMed]
13. Nakaishi H, Yamada Y. Abnormal tear dynamics and symptoms of eyestrain in operators of visual display terminals. Occup Environ Med. 1999 Jan;56(1):6-9. [PubMed]
14. Coles-Brennan C, Sulley A, Young G. Management of digital eye strain. Clin Exp Optom. 2019 Jan;102(1):18-29. [PubMed]
15. Mohan A, Sen P, Shah C, Jain E, Jain S. Prevalence and risk factor assessment of digital eye strain among children using online e-learning during the COVID-19 pandemic: Digital eye strain among kids (DESK study-1). Indian J Ophthalmol. 2021 Jan;69(1):140-144. [PubMed]
16. Lemp MA, Bron AJ, Baudouin C, Benítez Del Castillo JM, Geffen D, et al. Tear osmolarity in the diagnosis and management of dry eye disease. Am J Ophthalmol. 2011 May;151(5):792-798.e1. [PubMed]
17. Versura P, Campos EC. TearLab® Osmolarity System for diagnosing dry eye. Expert Rev Mol Diagn. 2013 Mar;13(2):119-29. [PubMed].

Received: 26 November 2020
Published online: 29 June 2021

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