April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
Power Vector Analysis of Refractive, Corneal and Lenticular Astigmatism in an Elderly Chinese Population: The Shihpai Eye Study
Author Affiliations & Notes
  • Yu-Chi Liu
    Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
    Department of Ophthalmology, National Yang Ming University School of Medicine, Taipei, Taiwan
  • Pesus Chou
    Community Medicine Research Center and Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
  • Pei-Yu Lin
    Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
    Department of Ophthalmology, National Yang Ming University School of Medicine, Taipei, Taiwan
  • Shih-Jen Chen
    Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
    Department of Ophthalmology, National Yang Ming University School of Medicine, Taipei, Taiwan
  • Jorn-Hon Liu
    Department of Ophthalmology, Cheng Hsin General Hospital, Taipei, Taiwan
  • Catherine J. Liu
    Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
    Department of Ophthalmology, National Yang Ming University School of Medicine, Taipei, Taiwan
  • Wen-Ming Hsu
    Department of Ophthalmology, Taipei Medical University Shuang-Ho Hospital, Taipei, Taiwan
  • Ching-Yu Cheng
    Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
    Department of Ophthalmology, National Yang Ming University School of Medicine, Taipei, Taiwan
  • Footnotes
    Commercial Relationships  Yu-Chi Liu, None; Pesus Chou, None; Pei-Yu Lin, None; Shih-Jen Chen, None; Jorn-Hon Liu, None; Catherine J. Liu, None; Wen-Ming Hsu, None; Ching-Yu Cheng, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 2514. doi:https://doi.org/
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      Yu-Chi Liu, Pesus Chou, Pei-Yu Lin, Shih-Jen Chen, Jorn-Hon Liu, Catherine J. Liu, Wen-Ming Hsu, Ching-Yu Cheng; Power Vector Analysis of Refractive, Corneal and Lenticular Astigmatism in an Elderly Chinese Population: The Shihpai Eye Study. Invest. Ophthalmol. Vis. Sci. 2011;52(14):2514. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To investigate the age-related trends in refractive, corneal and lentiuclar astigmatism and to assess the association between lenticular astigmatism and the severity of lens opacity, using vector methods in an elderly Chinese population in Taiwan.

Methods: : The Shihpai Eye Study was conducted among 1,360 inhabitants aged ≥65 years in Taipei, Taiwan, who undertook a detailed ocular examination, including measurements of refraction and corneal dioptric power using an autokeratorefractometer, and slit lamp biomicroscopy with lens grading using the modified Lens Opacity Classification System III. Of them, 810 participants were eligible for power vector analysis with the primary astigmatism (J0) and oblique astigmatism (J45) components. Lentiuclar astigmatism was derived as refractive minus corneal power values.

Results: : The crude prevalence rate of refractive astigmatism (defined ≤-0.75 diopters) was 73.0%. The vector value in both refractive J0 and corneal J0 tends to be more negative with increasing age (both P <0.001), indicating more "against-the-rule" (ATR) astigmatism. Corneal J0 alone accounted for 58% of variability in refractive J0. Both refractive J45 and corneal J45 also increased with age (P <0.001), with more prominent in refractive J45. There were no age trends in lenticular J0 and J45. Nuclear opacity was associated with lenticular J0 (P =0.006) and J45 (P =0.001). For one grade higher in nuclear opacity, lenticular J0 changed toward ATR by 0.04D, and lenticular J45 decreased by 0.05 D.

Conclusions: : Astigmatism affects three quarters of elderly Chinese population in Taiwan. With increasing age, the rates of astigmatism increases and refractive and corneal primary astigmatism shifts towards ATR, but lenticular astigmatism remains constant. Continuous corneal changes may be responsible for the age trends in refractive primary astigmatism. Nuclear lens opacity plays a major role in the change of lenticular astigmatism.

Keywords: astigmatism 
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