One school was chosen from each township's four and five grade classes, for a total of 252 schools. If a child in one of these targeted groups had uncorrected visual acuity (UCVA) of 6/12 or better in either eye, which could be increased to 36/12 in both eyes with the use of glasses, they were eligible to take part in the study.
The researchers started by giving math teachers, parents, and kids questionnaires. Children's personal information and questions concerning their vision were included in the surveys. Wealth and usage of the chalkboard were inquired about on the questionnaires given to parents and teachers, respectively. Each child's visual acuity was tested at the start of the trial. The children with UCVA £6/12 were then subjected to an automated refraction with subjective refining. At the start and conclusion of the research, math test results were evaluated using distinct timed and proctored tests that were acceptable for each grade level. At the conclusion of the study, self-report and direct examination methods were used to evaluate the wear of glasses.
Three solutions are offered to institutions at random: prescribed eyewear, vouchers towards free eyewear, or free eyewear (the control group). The voucher and control group kids did not know they could get expensive glasses at the end of the research if they required them.
The schools were then separated into two groups using randomization: those that got information supporting the use of glasses (such as viewing a movie, getting a pamphlet, or participating in a classroom) and those that did not.
Everything was written to demonstrate that vision is widespread in China, that glasses are the most secure and efficient type of therapy, and that children's eyes really aren't harmed by wearing glasses.
In the end, 3,177 kids from 251 schools were qualified to take part in the study.
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