Japanese Journal of Ophthalmology

, Volume 49, Issue 2, pp 127–133

Relationship between astigmatism and aging in middle-aged and elderly japanese

  • Kazuko Asano
  • Hideki Nomura
  • Makiko Iwano
  • Fujiko Ando
  • Naoakira Niino
  • Hiroshi Shimokata
  • Yozo Miyake
Clinical Investigation

DOI: 10.1007/s10384-004-0152-1

Cite this article as:
Asano, K., Nomura, H., Iwano, M. et al. Jpn J Ophthalmol (2005) 49: 127. doi:10.1007/s10384-004-0152-1

Abstract

Purpose

To study the effect of aging on astigmatism in adult Japanese.

Methods

Measurements of refractive errors and keratometry were performed on 2161 randomly selected subjects (aged 40–79 years). The relation between age and the net value in diopters (D) of astigmatism was evaluated with a trend test. The relation between age and the polar value was also examined by linear regression analysis.

Results

The mean (±SD) value of total and corneal astigmatism was −0.97 ± 0.72 D and −0.86 ± 0.63 D, respectively, and the net value of both increased with age (P trend < 0.001). The prevalence of either type of astigmatism also increased with age, according to the Cochran-Mantel-Haenzel test (P < 0.0001 for total and P < 0.01 for corneal astigmatism). The prevalence of against-the-rule astigmatism increased with age for either type of astigmatism (P < 0.0001 for total, P < 0.0001 for corneal). According to the analysis of polar values by age, the regression coefficient (±SE) for total and corneal astigmatism was −0.024 ± 0.002 (P < 0.0001) and −0.028 ± 0.002 (P < 0.0001), respectively. There was no statistical difference between these two regression coefficients.

Conclusions

The prevalence of astigmatism increases and the axis turns to against-the-rule with age. The result of the linear regression analysis indicates that the age-related change in astigmatism is mainly associated with changes in the cornea.

Key Words

against-the-ruleagingastigmatismcorneapolar value

Copyright information

© Japanese Ophthalmological Society 2005

Authors and Affiliations

  • Kazuko Asano
    • 1
  • Hideki Nomura
    • 1
  • Makiko Iwano
    • 1
  • Fujiko Ando
    • 2
  • Naoakira Niino
    • 2
  • Hiroshi Shimokata
    • 2
  • Yozo Miyake
    • 3
  1. 1.Department of OphthalmologyChubu National HospitalObuJapan
  2. 2.Department of EpidemiologyNational Institute for Longevity SciencesObuJapan
  3. 3.Department of OphthalmologyNagoya University, School of MedicineNagoyaJapan
  4. 4.Department of OphthalmologyChubu National HospitalObuJapan