The study conducted in Fengxian District, Shanghai, aimed to explore the relationship between the cleanliness of high school classrooms and students' visual acuity and refractive status, considering the students' heavy reliance on classroom settings for learning.
Researchers sampled 48 classrooms from 8 high schools, monitoring a cohort of 1087 students over a year while analyzing various environmental factors affecting their eyesight.
Findings showed significant increases in certain refractive issues, like astigmatism, but no notable change in uncorrected visual acuity; classroom features like size, blackboard height, and multimedia display distance were linked to these visual changes.