Effects of Binocular Acuity in Visual Impairment Assessment

Effects of Binocular Acuity in Visual Impairment Assessment

Author(s)

Guangfeng Wu, Lan Wang, Baozeng Li, Chao Zai, Shanyao Zhao, Hong Cao

Download Full PDF DOI: 10.18483/ijSci.853 Downloads: 79 Views: 264 Pages: 16-21

Volume 4 - October 2015 (10)

Abstract

Objective: To study the correlations and differences between best corrected visual acuity in the better eye (hereinafter referred to as monocular acuity in the better eye) and binocular acuity after both eyes were best corrected separately (hereinafter referred to as binocular acuity), the relationship between both monocular acuity in the better eye and binocular acuity and reading acuity as well as reading speed were discussed in order to investigate the effect of binocular acuity in visual impairment and visual disability assessment. Methods: Two thousand a hundred and fifteen subjects ranging in age from 18 to 40 years old were recruited for the study, whose best corrected monocular acuity were less than or equal to 0.8, and other visual functions examined were normal. Best corrected visual acuity was measured monocularly and binocularly using Standard Logarithm Distance Charts. Reading visual acuity and reading speed were also determined. Experimental data were statistically analyzed using SPSS19.0 statistical software. Results: Monocular acuity in the better eye and binocular acuity was linear correlation (r=0.920, P<0.001), and the differences of them were statistically significant (Z=-23.025, P<0.05); Reading acuity and both monocular acuity in the better eye and binocular acuity were also linear correlation (r=0.827, P<0.001; r=0.862, P <0.001); Reading acuity deteriorated with aggravation of visual impairment.There were no differences of reading speed in visual impairment individuals that more than or equal to 0.3; However ,reading speed in visual disability (visual acuity was less than 0.3) individuals were slowed down significantly. Conclusions: Both of monocular acuity in the better eye and binocular acuity could estimate visual function preferably. There were also differences between both of them. In view of people are simultaneously using both eyes in daily life, it is suggested that the visual function of binocular acuity was recommended in the evaluation of judicial forensic visual impairment and visual disability.

Keywords

Binocular Acuity; Visual Disability; Visual Impairment; Visual Function

References

  1. Azen S P, Varma R, Preston-Martin S, et al. Binocular visual acuity summation and inhibition in an ocular epidemiological study: the Los Angeles Latino Eye Study[J]. Investigative Ophthalmology and Visual Science, 2002, 43(6): 1742-1748.
  2. Social Security Administration: Social Security Online. Social Security Agency Web Site, available at www.ssa.gov (last accessed August 2001).
  3. Cagenello R, Halpern D L, Arditi A. Binocular enhancement of visual acuity[J]. JOSA A, 1993, 10(8): 1841-1848.
  4. Pradhan S. A comparison of binocular summation in young and older patients. Curr Eye Res. 1996;15:315–319.
  5. Home R. Binocular summation: a study of contrast sensitivity,
  6. visual acuity, and recognition. Vision Res. 1978;18:579–585.
  7. Pradhan S, Elliott DB. Clinical measurements of binocular summation and inhibition in patients with cataract. Clin Vis Sci. 1991;6:355–359.
  8. Guangji Wang. Binocular Vision [M]. People's Health Publishing House, 2004.
  9. Wu K T, Lee G S. Influences of monocular and binocular vision on postural stability[J]. Journal of vestibular research: equilibrium & orientation, 2015, 25(1): 15-21.
  10. Rubin G S, Munoz B, Bandeen–Roche K, et al. Monocular versus binocular visual acuity as measures of vision impairment and predictors of visual disability[J]. Investigative ophthalmology & visual science, 2000, 41(11): 3327-3334.
  11. Schneck M E, Haegerstöm-Portnoy G, Lott L A, et al. Monocular vs. Binocular Measurement of Spatial Vision In Elders[J]. Optometry and vision science: official publication of the American Academy of Optometry, 2010, 87(8): 526.
  12. Colenbrander A. Reading acuity—an important parameter of reading performance[C]//International Congress Series. Elsevier, 2005, 1282: 487-491.
  13. Yuliang Wang. Optometry [M]. People's military medical press, 2008.
  14. Ying Qi,Yuehua Zhou. Effect of Anisometropia and its Correction to Binocular Vision[J].Journal of Capital Medical University,2008, 29(6):762-765.
  15. Lin Li,Shengli Sun,Wei Lu.Clinical Observation on myopic anisometropia and binocular vision[J].Ophthalmology,2006, 15(5):324-326.
  16. Grisham J D, Simons H D. Refractive error and the reading process: a literature analysis[J]. Journal of the American Optometric Association, 1986.
  17. Consultation on development of standards for characterization of vision loss and visual functioning: Geneva, 4-5 September 2003[M]. World Health Organization, 2003.

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International Journal of Sciences is Open Access Journal.
This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License.
Author(s) retain the copyrights of this article, though, publication rights are with Alkhaer Publications.

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