Refractive Status of Indigenous People in the Northwestern Amazon Region of Brazil

@article{Thorn2005RefractiveSO,
  title={Refractive Status of Indigenous People in the Northwestern Amazon Region of Brazil},
  author={Frank Thorn and Antonio Augusto Velasco Cruz and Andr{\'e} Juc{\'a} Machado and Ricardo A C Carvalho},
  journal={Optometry and Vision Science},
  year={2005},
  volume={82},
  pages={267-272}
}
Purpose. The purpose of this study was to investigate the refractive status of the illiterate indigenous people of the upper Rio Negro region of the Amazon rain forest in northwestern Brazil. Methods. From an overall sample of 486 people, 259 indigenous people and 78 Brazilians between 12 and 59 years of age with no compromising optical opacities were refracted with cycloplegic retinoscopy. Subjects were categorized as indigenous if they had at least three generations of indigenous ancestry… 
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