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. 2021 Jan 14;139(3):293–300. doi: 10.1001/jamaophthalmol.2020.6239

Figure 1. Spherical Equivalent Refraction (SER) Distribution in Primary School Students Aged 6 to 13 Years.

Figure 1.

The number of eyes per year with certain SER is plotted at 6 consecutive years for different age groups (6-13 years). The vertical line in each distribution represents the mean. At age 6 to 8 years, the crest as well as the mean (vertical line) in 2020 were shifted to the left compared with previous years, indicating a myopic shift of SER in 2020. For children aged 9 to 13 years, no clear myopic shift was observed across the 6 years.