Seasonal variation in myopia progression and axial elongation: An evaluation of Japanese children participating in a myopia control trial

Miyuki Fujiwara, Satoshi Hasebe, Risa Nakanishi, Kohhei Tanigawa, Hiroshi Ohtsuki

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Purpose: To investigate the seasonal variations in myopia progression and axial elongation in Japanese children. Methods: Ninety-two children who were enrolled in a myopia-control trial and wearing single vision or progressive addition lenses were included in the analyses (mean ± SD age 11.4 ± 1.7 years, mean spherical equivalent refractive error -4.40 ± 1.38 D). Refractive error and axial length were measured every 6 months for 1.5 years by non-cycloplegic autorefraction and partial coherence interferometer, respectively. Myopia progression and axial elongation for each 6-month interval were calculated by subtracting the measure at the end of the interval from that at the beginning. Seasons were classified as summer, winter or others, based on mid-day of the 6-month period between visits. Results: Myopia progression was not significantly influenced by the season. After adjusting study groups (type of spectacles), years and age at the baseline, the mean (±SE) myopia progression was 0.35 ± 0.04 D for summer, 0.28 ± 0.06 D for winter and 0.38 ± 0.04 D for the others. In contrast, axial elongation was significantly influenced by the season, and the mean axial elongation was 0.137 ± 0.010 mm for summer, 0.170 ± 0.013 mm for winter and 0.163 ± 0.008 mm for the others. The seasonal variation in axial elongation, however, was smaller than that previously reported overseas. Conclusions: In Japanese children myopia progression did not slow in summer. Although axial elongation slightly decreased in summer, myopia progression seems to be fairly stable throughout the year.

Original languageEnglish
Pages (from-to)401-406
Number of pages6
JournalJapanese Journal of Ophthalmology
Volume56
Issue number4
DOIs
Publication statusPublished - Jul 2012

Keywords

  • Axial elongation
  • Myopia control trial
  • Myopia progression
  • Progressive addition lenses
  • Seasonal variations

ASJC Scopus subject areas

  • Ophthalmology

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