| Why carry out this study? |
| The description of refraction changes during the past 3 years in the coronavirus disease (COVID-19) pandemic has rarely been reported. |
| What was learned from the study? |
| The refractive status of schoolchildren showed an increasing myopic shift trend before and during the COVID-19 pandemic. |
| The low hyperopia, emmetropia, and mild myopia groups were more sensitive to environmental changes during COVID-19 than before. |
| A shifting trend towards an increase in myopia progression was greater in female participants than male participants. |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.