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Prevalence of myopia in Sherpa and Tibetan children in Nepal

Garner, Leon F.; Kinnear, Robert F.; Frith, Michael J.; Garner, Leon F; Kinnear, Robert F; Frith, Michael J; Owens, Helen

Authors

Leon F. Garner

Robert F. Kinnear

Michael J. Frith

Leon F Garner

Robert F Kinnear

Michael J Frith



Abstract

Background. Tibetan and Sherpa children living in Nepal share a common ancestry in Tibet and areas to the north of Nepal, but it is evident that these people experience widely contrasting educational and environmental conditions. The purpose of this study was to compare the prevalence of myopia in children with similar genetic backgrounds but who are exposed to contrasting environments. Methods. Unaided vision and refractive error was measured in 555 Tibetan children in Kathmandu and 270 Sherpa children in the Solu Khumbu region of Nepal. Results. There were marked differences in vision and the prevalence of myopia in the two groups. Ninety-two percent of the Sherpa children had Snellen vision of 20/22 (0.89) or better compared with 70% of the Tibetan children. The range of refractive errors was -6.50 to +7.00 D for the Tibetan children and -1.00 to +3.50 D for the Sherpa children. The Sherpa children had a prevalence of myopia of 2.9% compared with 21.7% for the Tibetan children. Conclusions. The prevalence of myopia in Sherpa children is low and their rural lifestyle appears to be relatively unstressed. Tibetan children have a higher prevalence of myopia and more rigorous schooling. We did not establish a causal relationship between myopia and the type of schooling, or the environment in general, but we did demonstrate that a simple, rural lifestyle is at least compatible with a virtual absence of myopia.

Citation

Frith, M. J., Kinnear, R. F., Garner, L. F., Garner, L. F., Owens, H., Kinnear, R. F., & Frith, M. J. (1999). Prevalence of myopia in Sherpa and Tibetan children in Nepal. Optometry and Vision Science, 76(5), 282-285. https://doi.org/10.1097/00006324-199905000-00014

Journal Article Type Article
Acceptance Date Dec 1, 1998
Publication Date May 1, 1999
Journal Optometry and Vision Science
Print ISSN 1040-5488
Publisher Lippincott, Williams & Wilkins
Peer Reviewed Peer Reviewed
Volume 76
Issue 5
Pages 282-285
DOI https://doi.org/10.1097/00006324-199905000-00014
Keywords myopia, Sherpa, Tibetan, children, Nepal
Public URL https://uwe-repository.worktribe.com/output/1096777
Publisher URL http://dx.doi.org/10.1097/00006324-199905000-00014

This file is under embargo due to copyright reasons.

Contact helen3.owens@uwe.ac.uk to request a copy for personal use.




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