Correcting Myopia Among Secondary School Children to Increase Academic High School Attendance Rates in Rural Communities — SWISH  

Refractive Errors Clinical Trial

Official title: SWISH (See Well to Stay In ScHool): Randomised Trial of Spectacle Distribution to Secondary School Children With Myopia to Increase Academic High School Attendance Rates in Rural Communities)

Status Not yet recruiting

Clinical Trial Summary

Chinese children are some of the most short-sighted in the world, but only one in five children in poor areas who needs glasses has them. Our team has already shown in other trials that giving children free glasses leads to better grades and that free glasses have a bigger impact on grades than factors like parents' education level and the amount of money a family has. The effect on grades from glasses is greater than from other health services in school, like giving vitamins. Only about one in three children in rural western China goes on to a regular, non-vocational high school. The investigators would like to show the Chinese government strong evidence of what glasses can do to help children continue their education, in order to help convince the government to carry out national programs to provide free glasses for children who need them.

Study Plan: The investigators will choose 130 middle schools at random in Ningxia, western China, and all children in Years 1 and 2 (one class each) at each school will go at random into one of two groups: either a group getting free glasses, with support from teachers to push them to wear the glasses ("Intervention") or a group getting just glasses prescriptions ("Control.") The main study outcome will be the proportion of children going on to academic (as opposed to vocational) high school, and the study is powered to detect a 10% difference in this figure between groups.The study will also assess children's test scores, whether they wear their glasses at school, and how often they use blackboards (which disadvantage short-sighted children) vs textbooks to learn from. These other outcomes will help us to better understand the causal pathway between vision and high school attendance. We will also study the total cost of providing glasses glasses and the teacher support to wear them per additional student attending academic high school. The hypothesis of this study is that providing glasses will increase academic high school attendance.

Clinical Trial Description

Research question: Will providing free glasses to myopic rural Chinese students, with a teacher incentive to promote use, increase academic high school attendance?

Design: Cluster-randomised controlled trial

Rationale: Rural Chinese children have high myopia prevalence, but poor access to glasses. Our previous trials show giving free glasses significantly improves academic performance, with greater effect size than parental education or family income, equaling or exceeding other classroom-based medical interventions. Non-vocational (academic) high school attendance is only 30% in rural western China. Strong evidence of educational benefit from glasses is needed to spur adoption of national distribution programs.

Methods: Children in Year 1 and 2 (1 class each) at 130 randomly-selected middle schools in Ningxia, western China, will be randomized by school to receive free glasses and a trial-proven teacher-based incentive to promote wear (Intervention) or prescriptions only (Control). The main outcome 2-3 years later will be high school attendance (powered to detect 10% difference between study groups); secondary outcomes of compliance, test scores and use of near versus distance classroom learning aids will elucidate biological plausibility of a causal pathway between myopia correction and learning. Local knowledge and attitudes about myopia and spectacle use and intervention cost-effectiveness will be studied.

Statistical methods to be employed in the analysis and justification for the choice of sample size:

Adjusted- and unadjusted-comparison of the difference between study groups

• Of academic high school attendance

• of mathematics test performance at endline (adjusted for baseline),

• of observed spectacle wear at un-announced examinations

Sample size: Assuming 50% of children will fail vision screening, 70% of these needing glasses, with loss to follow-up=10%, α=0.05, intra-class correlation=0.15, explained variation by covariates=0.40, difference between the groups in the main study outcome=10%, high-school attendance rate in the Control group=30%, a sample size of 130 middle-schools (65 in each group) will provide power=85%. ;

Related Conditions & MeSH terms

• Myopia
• Refractive Errors

• NCT number: NCT04077086
• Study type: Interventional
• Source: Queen's University, Belfast
• Contact: Nathan Congdon, MD, MPH
• Phone: 07748751393
• Email: ncongdon1@gmail.com
• Status: Not yet recruiting
• Phase: N/A
• Start date: September 1, 2022
• Completion date: July 1, 2025