Myopia’s Long Reach in Japan

Researchers use retail optical data to track refractive change nationwide

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Myopia progression may start earlier and continue later than previously thought, based on an analysis of over 4.5 million spectacle wearers in Japan.
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The study found that median spherical equivalent stabilized at approximately -3.3 D for men and -3.5 D for women by ages 30 and 29, respectively.
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High myopia was present in 1.3% of spectacle-wearing children under 10 years, with significant increases in myopia observed from age 10.
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The fastest median myopic progression occurred at age seven, reaching approximately -1.1 D per year, with deceleration noted at various ages.
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Regional and sex-related differences were observed, with men being more myopic at younger ages and women showing greater myopia after age 26.

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