Acta Scientific Ophthalmology (ISSN: 2582-3191)

Research Article Volume 5 Issue 3

Effect of Anisometropic Correction on Binocularity at Al-Ibrahim Eye Hospital, Karachi

Priyanka1*, Sadaf Fatima2, Savaira Sarwar2, Malik Anjum Fayyaz2, Manoj Johrani2 and Rabia Akbar2

1BS (Vision Sciences), M.Phil Optometry, Lecturer, ISRA School of Optometry, Al-Ibrahim Eye Hospital, Karachi, Pakistan
2BS (Vision Sciences), Internee Optometrist, Al-Ibrahim Eye Hospital, Karachi, Pakistan

*Corresponding Author: Priyanka, BS (Vision Sciences), M.Phil Optometry, Lecturer, ISRA School of Optometry, Al-Ibrahim Eye Hospital, Karachi, Pakistan.

Received: February 01, 2022; Published: February 28, 2022


Introduction: Anisometropia is a condition in which the two eyes have unequal refractive power one eye may be markedly stronger than the other. Anisometropia affects our binocular vision. Individual with anisometropia typically see one eye larger image in one eye and one smaller image in the other eye.

Objective: To determine the effect of anisometropic correction on binocularity in Al-Ibrahim eye hospital, Malir Karachi.

Methods: A Cross Sectional Descriptive study was carried out in Al-Ibrahim eye hospital, Malir Karachi from July 2021 to December, 2021. Non-Probability Convenient sampling technique was used. This study involved 52 subjects who diagnosed with different types of Anisometropia of age range 10-30 years, of both genders. Demographic data, history of onset, visual acuity of every subject was checked and recorded separately both for near and distance, with and without glasses and with pin-hole, objective and subjective refraction were performed. Stereopsis was evaluated by Lang I, Lang II and Frisby test. Worth four dots test was also performed to evaluate the binocular single vision. SPSS version 20.0 was used to analyze the data.

Results: A total of 52 subjects were included in this study. Out of 52 subjects, 29 were males and 23 were females. Most of the subjects showed the degree of anisometropia of range (2.50 -3.00D). Astigmatism was most commonly presented in subjects among other refractive errors. Visual acuity was seen to be better after anisometropic correction showed significant result with p-value 0.000. There was slight change in stereo acuities with Lang I, Lang II and Frisby stereo acuity tests and all the subjects were indicated with normal fusional status by worth four dot test.

Conclusion: This study revealed that there was change in stereo acuities among all groups of degrees of anisometropia. There was no any association found between the age and degree of anisometropia on the Stereopsis and binocular single vision. Fusional status was normal showed the normal retinal correspondence.

Keywords: Anisometropia; Stereopsis; Lang I; Lang II; Frisby; Worth Four Dot Test


  1. Von Noorden GK and Campos EC. “Binocular Vision and Ocular Motility, Theory and Management of Strabismus”. St Louis, Mosby (2002).
  2. Taylor D and Hoyt CS. “Pediatric Ophthalmology and Strabismus”. Edinburgh: Elsevier (2005).
  3. Andalib D., et al. “Factors affecting improvement of stereopsis following successful surgical correction of childhood strabismus in adults”. Strabismus 23 (2015): 80‑
  4. O'Donoghue L., et al. “Profile of anisometropia and aniso-astigmatism in children: prevalence and association with age, ocular biometric measures, and refractive status”. Investigative Ophthalmology and Visual Science 1 (2013): 602-608.
  5. Grosvenor T. “Primary Care Optometry”. 5th edition. Butterworth Heinemann, China: Duncan L (2007).
  6. Lee JY., et al. “The effects of glasses for anisometropia on stereopsis”. American Journal of Ophthalmology 6 (2013): 1261-1266.
  7. Fawcett SL and Birch EE. “Validity of the Titmus and Randot circles tasks in children with known binocular vision disorders”. Journal of AAPOS 7 (2003): 333‑
  8. Elliot D. “Clinical procedures in primary eye care”. 3rd edition. Edinburgh: Elsevier/Butterworth Heinemann (2007): 318.
  9. Julesz B. “Foundations of Cyclopean Perseption”. The American Journal of Psycology University of Chicago Press 3 (1971): 667-669.
  10. Levy NS and Glick EB. “Stereoscopic perception and snellen visual acuity”. American Journal Ophthalmology 78 (1974): 722.
  11. Cooper J and Feldman J. “Random-dot-stereogram performance by strabismic, amblyopic and ocular-pathology patients in an operant-discrimination task”. American Journal Ophthalmic and Physiological Optics 55 (1978): 599.
  12. A Sunita., et al. “Anisometropia”. Journal of Ophthalmology India 2 (2002).
  13. Nausheen N., et al. “Acceptance of correct visual acuity prescription after counseling in Patients with anisometropia”. Biometrics and Biostatistics International Journal 4 (2018): 364.
  14. Singh P., et al. “A study of prevalence of anisometropia and associated amblyopia in parients with refractive error”. Archives Ophthalmology (2015): 3.
  15. Mohsen A., et al. “Prevalence of strabismic binocular anomalies, amblyopia and anisometropia”. Journal of Optometry 3 (2011): 110-114.
  16. Linke S J., et al. “Prevalence and association of anisometropia with spherical ametropia, cylindrical power, Age and sex in refractive surgery”. Invest Ophthalmology Visual Science 10 (2011): 7538-7547.
  17. Kanwal Z., et al. “Anisometropia in school going children”. Journal of Rawalpindi National College 3 (2009).
  18. Hashim H., et al. “Prevalence and risk factors for anisometropia in the Tehran eye study Iran”. Ophthalmic Epidemiology 3 (2011): 122-128.
  19. Oguz H and Oguz V. “The effects of experimentally induced anisometropia on stereopsis”. Journal of Pediatric Ophthalmology and Strabismus 4 (2000): 214-218.
  20. Fawsett SL and Birch EE. “Validity of the Titmus and Randot circles tasks in children with known binocular vision disorders”. Journal of AAPOS 7 (2003): 333-338.
  21. Umme H and Zahid H. “Comparison of stereopsis and contrast sensitivity in myopic and hyperopic anisometropia”. Ophthalmology1 (2020).
  22. Tomac S and Bridal E. “Effects of anisometropia on binocularity”. Journal of Pediatric Ophthalmology and Strabismus 1 (2001): 27-33.
  23. Dedeya S., et al. “The effect of anisometropia on binocular visual function”. Indian Journal of Ophthalmology 4 (2001): 261-263.
  24. Brooks SE., et al. “Anisometropia and Binocularity”. Ophthalmology 7 (1996): 1139-1143.


Citation: Priyanka., et al. “Effect of Anisometropic Correction on Binocularity at Al-Ibrahim Eye Hospital, Karachi".Acta Scientific Ophthalmology 5.3 (2022): 60-64.


Copyright: © 2022 Priyanka., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Acceptance rate35%
Acceptance to publication20-30 days
ISI- IF1.042
JCR- IF0.24

Indexed In

News and Events

  • Certification for Review
    Acta Scientific certifies the Editors/reviewers for their review done towards the assigned articles of the respective journals.
  • Submission Timeline for Upcoming Issue
    The last date for submission of articles for regular Issues is June 25, 2024.
  • Publication Certificate
    Authors will be issued a "Publication Certificate" as a mark of appreciation for publishing their work.
  • Best Article of the Issue
    The Editors will elect one Best Article after each issue release. The authors of this article will be provided with a certificate of "Best Article of the Issue"
  • Welcoming Article Submission
    Acta Scientific delightfully welcomes active researchers for submission of articles towards the upcoming issue of respective journals.

Contact US