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Prevalence and risk factors of pterygium and pinguecula: the Tehran Eye Study

Eye volume 23, pages 11251129 (2009) | Download Citation

Competing interests: None

Abstract

Purpose

To determine the prevalence and causes of pterygium and pinguecula in the population of Tehran in 2002.

Methods

In a cross-sectional population study with cluster sampling, 6497 residents of Tehran were selected from 160 clusters. Samples were chosen according to a door-to-door head counting and were then invited for free examinations. After the interview, ophthalmic examinations were performed at an eye clinic.

Results

Of the selected sample, 4564 people (70.3%) participated in the study. The age- and gender-standardized prevalence of pterygium in this population was 1.3% (95% confidence interval (CI): 0.9–1.6%). The prevalence of pterygium was 1.4 and 1.1% in men and women, respectively (P>0.05). The prevalence of pinguecula in this study was 22.5% (95% CI: 21.1–24.0%); 27.1% in men and 17.7% in women (P<0.001). In both genders, the prevalence of pterygium and pinguecula showed a significant increase with age (P<0.001).

Conclusions

This study concerns the status of pterygium and pinguecula according to age and gender in the population of Tehran. The overall prevalence rates were 1.3 and 22.5% for pterygium and pinguecula, respectively. The comparison of the results with those reported from other areas of the world suggests lower prevalence rates in Tehran.

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Acknowledgements

This project was funded in part by the Noor Vision Correction Center and a grant from the Iranian National Research Center for Medical Sciences. The selection of clusters was based on block enumeration of the National Census of 1996 by the Iranian Statistics Center.

Author information

Affiliations

  1. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Iran

    • A Fotouhi
    • , M Khabazkhoob
    •  & K Mohammad
  2. Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran

    • H Hashemi
    •  & M Khabazkhoob
  3. Farabi Eye Hospital, School of Medicine, Tehran University of Medical Sciences, Iran

    • H Hashemi

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Corresponding author

Correspondence to A Fotouhi.

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DOI

https://doi.org/10.1038/eye.2008.200

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