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Asharlous A, Doostdar A, Ghaemi V, Farzi M, Yekta A, Mortazavi A, Ostadimoghaddam H, Khabazkhoob M. Binocular Function in Different Gaze Positions. JOVR [Internet]. 2022Apr.29 [cited 2024Apr.25];17(2):209–216. Available from: https://knepublishing.com/index.php/JOVR/article/view/10792

https://doi.org/10.18502/jovr.v17i2.10792

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authors

  • Amir Asharlous

    Amir Asharlous

    Rehabilitation Research Center, Department of Optometry, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
  • Asgar Doostdar

    Asgar Doostdar

    Rehabilitation Research Center, Department of Optometry, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
  • Vahid Ghaemi

    Vahid Ghaemi

    Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
  • Mina Farzi

    Mina Farzi

    Rehabilitation Research Center, Department of Optometry, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
  • Abbasali Yekta

    Abbasali Yekta

    Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
    https://orcid.org/0000-0003-4356-9064
  • Abolghasem Mortazavi

    Abolghasem Mortazavi

    Sina Hospital, Department of Neurosurgery, Tehran University of Medical Sciences, Tehran, Iran
  • Hadi Ostadimoghaddam

    Hadi Ostadimoghaddam

    Refractive Errors Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
  • Mehdi Khabazkhoob

    Mehdi Khabazkhoob

    Department of Basic Sciences, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Published Date

  • Apr 29, 2022
This journal is publishing all the articles under Creative Commons Attribution License CC BY 4.0.

Binocular Function in Different Gaze Positions

Journal of Ophthalmic and Vision Research (JOVR) / April–June 2022, Volume 17, Issue 2 / Pages 209–216

Abstract

Purpose: To evaluate varied aspects of binocular function in multiple gaze positions.


Methods: In 2018, this cross-sectional study was conducted on 21 participants (male = 11) with an age range of 19–25 years. Having emmetropia and 10/10 visual acuity in both eyes were conditions of the inclusion criteria for the crosssectional study. The following aspects of binocular function including amplitude of accommodation (AA), near point of convergence, near phoria, and monocular accommodative facility were evaluated in five gazes (primary, upward, downward, left, and right) for all subjects.


Results: Near point of convergence values showed significant differences in all gaze positions (P < 0.001). The lowest near point of convergence value was seen in the primary gaze (2.69 cm) and the downward gaze (3.47 cm) and the highest near point of convergence value was seen in the left gaze (7.5 cm). There was also a significant difference in the amplitude of accommodation among the upward, downward, and the primary gaze (P < 0.001) positions but no difference was observed among the temporal, nasal, and the primary gaze positions. There was a significant difference in near phoria between the upward gaze and the primary gaze (P = 0.008) while no significant differences were observed among the other gazes. There was no significant variance in the monocular accommodative facility among the different gaze positions (P = 0.175).


Conclusion: The results of this study indicated variations that exist in the convergence and accommodation reflex functions in multiple gaze positions, which proved to be more prominent in the convergence system. Although the accommodative sufficiency evaluation was inconsistent among the multiple gaze positions, the accommodative facility evaluation was consistent in all gazes.

Keywords:

Accommodation, Binocular Vision, Convergence, Facility, Gaze, Phoria

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