| Title | Refractive error and biometry in older Chinese adults: the Liwan Eye Study. | | Author(s) | He M, Huang W, Li Y, Zheng Y, Yin Q, Foster PJ | | Institution | State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, 54 Xianlie Road, Guangzhou, 510060, China. | | Source | Invest Ophthalmol Vis Sci 2009 Jun 24. | | Abstract | Purpose: To assess the prevalence of refractive error and describe the distribution of ocular biometry and its association with refraction in adult Chinese.
Methods: Random clustering sampling was used to identify adults aged 50 years and over in Liwan District, Guangzhou. Refraction was determined by subjective refraction that achieved the best-corrected vision based on monocular measurement. Ocular biometry was measured by A-mode ultrasound using a handheld applanation probe.
Results: Among 1405 participants in the study, data from 1269 phakic right eyes were available for analysis. The prevalence of myopia (SE<-0.5 D), hyperopia (SE>+0.5 D), and astigmatism (cylinder>0.75 D) was 32.3% (95% CI: 27.8-34.6%), 40.0% (95% CI: 37.3-42.7%), and 48.3% (95% CI: 45.6-51.1%), respectively. The spherical equivalent tended to become hyperopic at 60 years and shift toward myopia at 75 years. Axial length did not change with age but was consistently shorter in women. Lens thickness increased with age and tended to be greater in women.
Conclusions: The prevalence of myopia and biometric distribution in this urban Chinese cohort are similar to those observed in Singaporean Chinese but greater than in Mongolians and Europeans. Further studies are needed to clarify the role of environmental factors in the myopia rates. | | Language | ENG | | Pub Type(s) | JOURNAL ARTICLE
| | PubMed ID | 19553618 |
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