The prevalence of anisometropia, amblyopia and strabismus in schoolchildren of Shiraz, Iran

Yekta, Abbas Ali, Fotouhi, Akbar, Hashemi, Hassan, Dehghani, Cirous, Ostadimoghaddam, Hadi, Heravian, Javad, Derakhshan, Akbar, Yekta, Reihaneh, Rezvan, Farhad, Behnia, Mehdi, & Khabazkhoob, Mehdi (2010) The prevalence of anisometropia, amblyopia and strabismus in schoolchildren of Shiraz, Iran. Strabismus, 18(3), pp. 104-110.

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To determine the prevalence of amblyopia, anisometropia, and strabismus in schoolchildren of Shiraz, Iran.


A random cluster sampling was used in a cross-sectional study on schoolchildren in Shiraz. Cycloplegic refraction was performed in elementary and middle school children and high school students had non-cylcoplegic refraction. Uncorrected visual acuity (UCVA) and best corrected visual acuity (BCVA) were recorded for each participant. Anisometropia was defined as spherical equivalent (SE) refraction difference 1.00D or more between two eyes. Amblyopia was distinguished as a reduction of BCVA to 20/30 or less in one eye or 2-line interocular optotype acuity differences in the absence of pathological causes. Cover test was performed for investigating of strabismus.


Mean age of 2638 schoolchildren was 12.5 years (response rate = 86.06%). Prevalence of anisometropia was 2.31% (95% confidence interval [CI], 1.45 to 3.16). 2.29% of schoolchildren (95% CI, 1.46 to 3.14) were amblyopic. The prevalence of amblyopia in boys and girls was 2.32% and 2.26%, respectively (p = 0.945). Anisometropic amblyopia was found in 58.1% of the amblyopic subjects. The strabismus prevalence was 2.02% (95% CI, 1.18 to 2.85). The prevalence of exotropia and esotropia was 1.30% and 0.59%, respectively.


Results of this study showed that the prevalence of anisometropia, amblyopia, and strabismus are in the mid range. The etiology of amblyopia was often refractive, mostly astigmatic, and non-strabismic. Exotropia prevalence increased with age and was the most common strabismus type.

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ID Code: 84775
Item Type: Journal Article
Refereed: Yes
Keywords: Prevalence, Refractive error, Anisometropia, Amblyopia, Strabismus
DOI: 10.3109/09273972.2010.502957
ISSN: 1744-5132
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Deposited On: 15 Jun 2015 00:37
Last Modified: 24 Jan 2017 22:17

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