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C.–Y. Cheng, W.–M. Hsu, J.–H. Liu, P. Chou; Power Vector Analysis of Refractive and Corneal Astigmatis in an Elderly Chinese Population: The Shihpai Eye Study . Invest. Ophthalmol. Vis. Sci. 2005;46(13):5627.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: Few epidemiologic data are available on astigmatism in elderly Asians. The purpose of the study was to investigate the refractive and corneal astigmatism in an elderly Chinese population in Taiwan. Methods: A population–based survey was conducted in the Shihpai district of Taipei, Taiwan. A total of 2,045 residents 65 years of age or older were randomly selected and invited to complete a comprehensive questionnaire and undertake an ocular examination, including best–corrected visual acuity, autorefraction and keratometry. Astigmatism was analyzed by power vector approach. Results: For refractive astigmatism, the mean primary component (J0) was –0.41 ± 0.55 D, and the mean oblique component (J45) was 0.09 ± 0.37 D in this elderly population. For corneal astigmatism, J0 was –0.34 ± 0.87 D, J45 was 0.08 ± 0.59 D. The J0 decreased significantly (more against–the–rule astigmatism) and the J45 increased significantly with advancing age (both P < 0.001). There was no gender difference in J0 or J45. Conclusions: Astigmatism is very common in the elderly Chinese population. The continuous changes in both components of corneal and refractive astigmatism into old age suggest the importance of regular refractive evaluation among them.
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