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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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Refractive errors in an elderly Japanese population: the Tajimi study.

Akira Sawada1, Atsuo Tomidokoro, Makoto Araie

  • 1Department of Ophthalmology, Gifu University Graduate School of Medicine, Gifu, Japan.

Ophthalmology
|February 5, 2008
PubMed
Summary

This study found a high prevalence of myopia (41.8%) in elderly Japanese individuals, with astigmatism increasing with age. Refractive errors varied by age, but not significantly by gender.

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Area of Science:

  • Ophthalmology
  • Epidemiology
  • Gerontology

Background:

  • Refractive errors are common in aging populations.
  • Understanding prevalence and associations is crucial for eye care.
  • Previous studies have not fully characterized these in elderly Japanese populations.

Purpose of the Study:

  • To determine the prevalence of refractive errors (myopia, hyperopia, astigmatism, anisometropia) in an elderly Japanese population.
  • To investigate associations between refractive errors, age, gender, and central corneal thickness.
  • To analyze astigmatism using both refraction and keratometry data.

Main Methods:

  • Population-based epidemiologic survey in Tajimi, Japan.
  • Inclusion of 3021 residents aged 40 years and older.
  • Comprehensive eye examinations including autokeratorefractometry, subjective refraction, and central corneal thickness measurement.

Main Results:

  • Prevalence of myopia was 41.8%, high myopia 8.2%, hyperopia 27.9%, refractive astigmatism 54.0%, and anisometropia 15.1%.
  • Myopia prevalence decreased with age until 70-79 years, then increased; hyperopia showed the opposite trend.
  • Astigmatism and anisometropia prevalence increased with age; gender differences were minimal except for keratometry.

Conclusions:

  • The prevalence of myopia in this elderly Japanese population is high (41.8%).
  • Age is significantly associated with refractive errors and astigmatism.
  • A trend towards against-the-rule astigmatism was observed with increasing age.