Prevalence and risk factors of refractive errors among schoolchildren in Shiraz, Iran

Yekta, Sr., A., Fotouhi, A., Hashemi, H., Dehghani, C., Ostadimoghaddam, H., Heravian, J., Derakhshan, A., Mehravaran, S., Yekta, R., & Khabazkhoob, M. (2009) Prevalence and risk factors of refractive errors among schoolchildren in Shiraz, Iran. In ARVO 2009, 9-12 September 2009, Ericeira, Portugal.


Purpose: To determine the prevalence and risk factors of refractive errors among schoolchildren in Shiraz, Iran.

Methods: In a cross-sectional study, using random cluster sampling, 3065 Shiraz schoolchildren were selected in this study. The participants totaled 2683; 1872 elementary and middle school and 811 high school students. For the primary and middle schoolchildren, cycloplegic refraction and for the high school students, non-cycloplegic autorefraction was measured. Myopia, defined as spherical equivalent (SE) refraction -0.50 diopter (D) or worse, hyperopia as SE +2.00D and +0.50D or more for cycloplegic and noncycloplegic refractions respectively, and astigmatism as cylinder -0.75D or worse.

Results: The prevalence of refractive errors in elementary and middle school students was: myopia 4.35 % (95% confidence interval (CI), 2.89 -5.81), hyperopia 5.04 % (95%CI, 3.49 -6.58) and astigmatism 11.79 % (95%CI, 10.21 -13.38). For high school students, these rates were 22.4 % (95%CI, 18.44 -26.36), 10.52 % (95%CI, 6.75 -14.29) and 20.99% (95%CI, 16.55 -25.44), respectively.The prevalence of myopia increased with age in primary and middle school students (OR=1.15, 95% CI, 0.98 to1.33, p=0.073).

Conclusions: The result of this study indicated a relatively low prevalence of refractive errors among schoolchildren in Shiraz according to the protocol by "Refractive Error Study in Children" (RESC) in other investigations.

Impact and interest:

21 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 84780
Item Type: Conference Item (Poster)
Refereed: Yes
Additional Information: Abstract published in Invest Ophthalmol Vis Sci 2009; 50: E-Abstract 2436
Additional URLs:
Keywords: Prevalence, Refractive error, myopia, hyperopia, astigmatism
ISSN: 1552-5783
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2009 ARVO
Deposited On: 16 Jun 2015 05:42
Last Modified: 24 Jan 2017 22:17

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page