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. 2007 May;91(5):579-84.
doi: 10.1136/bjo.2006.105734. Epub 2006 Nov 23.

Prevalence and causes of visual impairment and blindness in Sistan-va-Baluchestan Province, Iran: Zahedan Eye Study

Hossein-Ali Shahriari  1 , Shahrokh Izadi, Mohammad-Reza Rouhani, Farzaneh Ghasemzadeh, Ali-Reza Maleki
Affiliations

Prevalence and causes of visual impairment and blindness in Sistan-va-Baluchestan Province, Iran: Zahedan Eye Study

Hossein-Ali Shahriari et al. Br J Ophthalmol. 2007 May.

Abstract

Aim: To determine the prevalence and causes of visual impairment and blindness in the Sistan-va-Baluchestan Province of Iran.

Methods: A population-based cross-sectional study with a multistage cluster sampling technique was used to identify the study subjects. Visual acuity (VA) was defined for all participants aged >or=10 years. Participants with a VA of <20/60 were examined by an ophthalmologist to determine the causes of low vision or blindness.

Results: 5446 (84.0%) of the invited people were examined. The prevalence of visual impairment (VA <20/60) was 6.81% (95% CI 5.91% to 7.71%) and of bilateral blindness (VA <3/60) was 0.79% (95% CI 0.50% to 1.08%). Visual impairment increased with age and illiteracy. Bilateral blindness doubled in women aged >40 years. The causes of visual impairment and blindness were cataract (37.7%), corneal opacity (15.0%), amblyopia (15.0%), glaucoma (5.7%) and hyperopia (5.0%). 39.5% of the visual impairment cases were potentially curable.

Conclusion: The estimated magnitude of visual impairment and blindness was much higher than our expectations. Further investigation of the pattern of vision loss in women and children, particularly as a result of trachoma and amblyopia, is warranted. Implementation of measures to treat curable cases of the study population can improve the situation in the region dramatically.

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Conflict of interest statement

Competing interests: None.

References

    1. World Health Organization Prevention of avoidable blindness and visual impairment. In: Fifty‐ninth World Health Assembly. Geneva: WHO; 2006, A59/12 p. 1–3. http://www.who.int/gb/e/e_wha59.html (accessed 20 Feb 2007)
    1. Brundtland G H.World Blindness Day 2002. Geneva, Switzerland, 2002. http://www.who.int/dg/speeches/2002/geneva/en/ (accessed 20 Feb 2007)
    1. World Health Organization WHO launches project to prevent blindness in children. Press release. Geneva: WHO, 2002, Report Number: WHO/48. http://www.who.int/mediacentre/news/releases/release48/en/print.html (accessed 20 Feb 2007)
    1. Gilbert C, Foster A. Childhood blindness in the context of vision 2020: the right to sight. Bull World Health Organ 200179227–232. - PMC - PubMed
    1. Fotouhi A, Hashemi H, Mohammad K.et al The prevalence and causes of visual impairment in Tehran: the Tehran Eye Study. Br J Ophthalmol 200488740–745. - PMC - PubMed

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