Figure 2. Mean Spherical Equivalent Refraction (SER) for Primary School Students Aged 6 to 13 Years During the 6 Years of Screenings.

Substantial decreases of SER in 2020 were noted for children aged 6 to 8 years compared with previous years. Overall, girls tended to be more myopic than boys at the same age, while the right eye tended to be more myopic than the left eye. Whiskers indicate SEM.