Refractive errors in a rural Korean adult population: The Namil Study

Y. C. Yoo, J. M. Kim, K. H. Park, C. Y. Kim, T. W. Kim

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Purpose: To assess the prevalence of refractive errors, including myopia, high myopia, hyperopia, astigmatism, and anisometropia, in rural adult Koreans. Methods: We identified 2027 residents aged 40 years or older in Namil-myeon, a rural town in central South Korea. Of 1928 eligible residents, 1532 subjects (79.5%) participated. Each subject underwent screening examinations including autorefractometry, corneal curvature measurement, and best-corrected visual acuity. Results: Data from 1215 phakic right eyes were analyzed. The prevalence of myopia (spherical equivalent (SE) <-0.5 diopters (D)) was 20.5% (95% confidence interval (CI): 18.2-22.8%), of high myopia (SE <-6.0 D) was 1.0% (95% CI: 0.4-1.5%), of hyperopia (SE>+0.5 D) was 41.8% (95% CI: 38.9-44.4%), of astigmatism (cylinder <-0.5 D) was 63.7% (95% CI: 61.0-66.4%), and of anisometropia (difference in SE between eyes >1.0 D) was 13.8% (95% CI: 11.9-15.8%). Myopia prevalence decreased with age and tended to transition into hyperopia with age up to 60-69 years. In subjects older than this, the trend in SE refractive errors reversed with age. The prevalence of astigmatism and anisometropia increased consistently with age. The refractive status was not significantly different between males and females. Conclusion: sThe prevalence of myopia and hyperopia in rural adult Koreans was similar to that of rural Chinese. The prevalence of high myopia was lower in this Korean sample than in other East Asian populations, and astigmatism was the most frequently occurring refractive error.

Original languageEnglish
Pages (from-to)1368-1375
Number of pages8
JournalEye (Basingstoke)
Issue number12
Publication statusPublished - 2013 Dec

Bibliographical note

Funding Information:
This study was supported by Alcon Korea, Merck Korea, Pfizer Korea, Taejoon Pharmaceutical, Zeiss Korea, and the Korean Ophthalmological Society.

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Sensory Systems


Dive into the research topics of 'Refractive errors in a rural Korean adult population: The Namil Study'. Together they form a unique fingerprint.

Cite this