The Claim
Among Chinese schoolchildren aged 6-7 years followed for four years, prolonged daily homework exposure exceeding two hours per day is associated with a higher incidence of myopia, with a cumulative change in spherical equivalent refraction of -1.20 ± 1.00 diopters and 42.9% developing myopia by age 10-11.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Chinese children aged 6-7 who spent more than two hours per day on homework developed myopia at a higher rate by age 10-11, with an average worsening of their vision by 1.20 diopters.
See the scientific wording
Among Chinese schoolchildren aged 6-7 years followed for four years, those who spent more than two hours per day on homework had a higher incidence of myopia, with a cumulative change in spherical equivalent refraction of -1.20 ± 1.00 diopters and 42.9% developing myopia by age 10-11, suggesting that prolonged near-work activities are associated with myopia development in this population.
When a child looks at close objects for long periods, the eye's focusing muscle stays tightly contracted. This keeps the lens bent and pulls on the back of the eye, causing the eyeball to stretch longer over time. A longer eyeball makes light focus in front of the retina instead of on it, leading to blurry distance vision.
What the research says
1 studyKids in China who did more than two hours of homework every day for four years were more likely to become nearsighted by age 10 or 11, and the study found this link is real, even after considering other factors.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.