COVID and MYOPIA?

Recent research coming out of a province in China is suggesting that kids are developing MYOPIA (or short-sightedness) at up to a 3 times higher rate than in previous years!
Why is this?
Could it be...SCREEN TIME??
Duh duh duuhhhhhh!
REFERENCE:
Wang, J., Li, Y., Musch, D. C., Wei, N., Qi, X., Ding, G., … Qian, X. (2021). Progression of Myopia in School-Aged Children after COVID-19 Home Confinement. JAMA Ophthalmology, 139, 293-300.