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Category: Volume 11 Issue 01 January 2023
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Title: Effect of Illumination Over Fusional Vergence – A Narrative Review

Authors: Raisul Azam, Gaurav Kumar Bhardwaj, Sourav Karmakar, Animesh Mondal

 DOI: https://dx.doi.org/10.18535/jmscr/v11i1.10

Abstract

Introduction: Most of the studies shows that illumination is one of the important aspects in our working environment as well as while reading and writing. A low illumination can affect the various ocular parameters like accommodation, vergence, reading speed also and to find out what should be an optimal level of illumination and type of illumination to be used. Convergence and illumination have significant relation with change in pupil size. In low illumination as pupil size increase with that depth of focus decreases, which leads to cause more exertion on accommodation and convergence which causes visual fatigue symptoms.

Objective: The objective of this article was to update on recent investigationshow illumination effects the fusional vergence and other ocular status. Therefore, conducted a search of the studies published about the same.

Method: A bibliographic search was conducted limited to publication referring to illumination and their effects on ocular status using the data base of PubMed, Research Gate, Google scholar. Different strategies were there for selecting articles.

Conclusion: The conclusion of the review was that mostly the accommodation, convergence and fusional vergence. In fusional vergence mostly positive fusional vergence which were changed with change in the illumination, and a proper intensity of illumination as well as position of illumination is important for an effective work environment to reduce different kind of ocular symptoms. As Lighting influences users’ visual strain and well-being. Therefore, creating awareness regarding lighting that ensures visual work conditions do not result in visual fatigue is a preventive activity.

Keywords: Illumination, Positive fusional Vergence, Negative fusional Vergence, Accommodation.

Key Messages (Provide appropriate messages of about 35-50 words to be printed in centre box):

As Illumination plays an important role in our life. Its standards and their position has important role in work efficiency, reading and writing speed by increasing our visual comfort. As our vergence and accommodation are affected with different levels of illumination which can be a cause for significant ocular changes.

References

  1. Draft of Indian Standard Luminaries, Handbook Part-5, Particular requirements Lighting Chains.
  2. Illumination Engineering society, Handbook.
  3. Illumination Engineering and Luminaries, Handbook-133096120/BIS-Standards society.
  4. ANSI-American National Standard Institute, Handbook.
  5. Ram MS, Bhardwaj R. Effect of different illumination sources on reading and visual performance. Journal of Ophthalmic and Vision Research. 2018 Jan 1;13(1):44–9.
  6. Wolska A. Visual strain and lighting preferences of vdt users under different lighting systems. International Journal of Occupational Safety and Ergonomics. 2003;9(4):431–40.
  7. Lam D, Cheuk W, Leung A, Fan D, Cheng H, Chew S. Eye care when using video display terminals. 1999.
  8. Motlagh M, Geetha R. Physiology, Accommodation. StatPearls. 2021 Jul 22
  9. Mehra D, Moshirfar M. Neuroanatomy, Optic Tract. StatPearls. 2021 Jul 31
  10. Belliveau AP, Somani AN, Dossani RH. Pupillary Light Reflex. StatPearls. 2019 Feb 7
  11. Cline David, Hofstetter HW, Griffin JR. Dictionary of visual science. Boston: Butterworth-Heinemann, 1997. 820.
  12. Benjamin WJ. Borish’s clinical refraction. 2nd ed. Borish’s Clinical Refraction. St. Louis Mo.: Butterworth Heinemann/Elsevier; 2006.
  13. ’Scheimen M’ WB’. Clinical Management of Binocular Vision. Fourth. Wolters Kluwer, Lippincott Williams & Wilkins; 2014. 01–722.
  14. NOORDEN V, GK. Physiology of the ocular movements. Binocular vision and ocular motility. 2002;52–84.
  15. Lança CC, Rowe FJ. Measurement of fusional vergence: a systematic review. https://doi.org/101080/0927397220191583675. 2019 Apr 3;27(2):88–113.
  16. Shin HS, Park SC, Park CM. Relationship between accommodative and vergence dysfunctions and academic achievement for primary school children. Ophthalmic and Physiological Optics. 2009 Nov 1;29(6):615–24.
  17. Flitcroft DI. A model of the contribution of oculomotor and optical factors to emmetropization and myopia. Vision Research. 1998 Oct 1;38(19):2869–79.
  18. Fisch A. Clinical Examination of the Cranial Nerves. Nerves and Nerve Injuries. 2015 Jan 1; 1:195–225.
  19. Majumder C, Sinathamby L. Effect of Illumination over Positive Fusional Vergence when Using VDU as Target. Journal of Clinical & Experimental Ophthalmology. 2017;08(03).
  20. Chen Y, Wang Y, Yu X, Xu A, Jiang J, Chen H. Effect of Illumination on Ocular Status Modifications Induced by Short-Term 3D TV Viewing. Neural Plasticity. 2017;2017.
  21. Okada Y, Kojima T, Oohashi T, Miyao M. The effect of environmental illumination and screen brightness on accommodation and convergence. Digest of Technical Papers - SID International Symposium. 2013;44(1):1078–81.
  22. Jiang BC, Gish KW, Leibowitz HW. Effect of luminance on the relation between accommodation and convergence. Optometry and Vision Science: Official Publication of the American Academy of Optometry. 1991 Mar 1;68(3):220–5.
  23. Avci AN, Memikoğlu İ. Effects of LED Lighting on Visual Comfort with Respect to the Reading Task.
  24. Lin CJ, Feng WY, Chao CJ, Tseng FY. Effects of VDT workstation lighting conditions on operator visual workload. Industrial Health. 2008 Mar;46(2):105–11.
  25. Arumi P, Chauhan K, Charmany WN. The College of Optometrists. Vol. 17, Ophthal. Plz~siol. Opr. 1997.
  26. Lin C-C, Huang K-C. Effects of Lighting Color, Illumination Intensity, and Text Color on Visual Performance. International Journal of Applied Science and Engineering. 2014 ;12(3):193–202.
  27. Lin C-C, Huang K-C. Effects of Lighting Color, Illumination Intensity, and Text Color on Visual Performance. International Journal of Applied Science and Engineering. 2014 ;12(3):193–202.
  28. American National Standards Institute., Illuminating Engineering Society. Committee on Industrial Lighting. American National Standard Practice for Industrial Lighting: ANSI IES-RP-7-1991, revision of ANSI IES-RP-7-1983. New York NY: Illuminating Engineering Society of North America; 1991. 50.
  29. LAUBLI, T. Visual impairments: in VDU operators related to environmental conditions. Ergonomic Aspects of Visual Display Terminals. 1980 ;85–94.
  30. Stammerjohn LW, Smith MJ, Cohen BGF. Evaluation of workstation design factors in VDT operations. Human Factors. 1981 Nov 23 ;23(4):401–12.

Corresponding Author

Raisul Azam

Department of Optometry and

Vision Science, Amity Medical

School, Amity University, Haryana, India