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Effect of School-Based Vision Screening on Refractive Error Detection among Secondary School Students in Nigeria

Abstract

Refractive errors are among the common causes of visual impairment and may negatively affect students' academic performance, classroom participation, school attendance, and overall quality of life when they remain undetected and uncorrected. Secondary school students may experience visual problems without recognizing them as health conditions requiring professional assessment, particularly when routine eye examinations are not readily accessible. School-based vision screening provides an opportunity to identify students with possible visual abnormalities within the school environment and facilitate referral for comprehensive eye examination and appropriate correction. School-based vision screening refers to organized visual assessment conducted among students within educational settings using standardized screening procedures to identify those who may require further eye evaluation. Refractive error detection refers to the identification of students suspected or confirmed to have conditions such as myopia, hyperopia, or astigmatism through appropriate screening and subsequent comprehensive optometric or ophthalmic assessment. In Nigeria, barriers such as limited access to eye-care services, cost of eye examinations, inadequate awareness, distance to eye-care facilities, and competing school or family responsibilities may contribute to undetected refractive errors among students. School-based screening may reduce some of these barriers by bringing basic vision assessment closer to students and creating an organized pathway for referral. Against this background, this study investigates the effect of school-based vision screening on refractive error detection among secondary school students in Nigeria. The study is anchored on the Health Belief Model, Andersen's Behavioral Model of Health Services Use, and the Preventive Health Model. The Health Belief Model explains participation in vision screening through perceived susceptibility to visual problems, perceived severity of potential consequences, perceived benefits of early detection, perceived barriers, and cues to action. Andersen's Behavioral Model explains healthcare utilization through predisposing characteristics, enabling resources, and healthcare needs, with school-based screening representing an important enabling resource for students. The Preventive Health Model provides a framework for understanding participation in preventive screening based on perceived risk, anticipated benefits, personal barriers, and motivation to undertake preventive health actions. Collectively, these theoretical perspectives provide a suitable framework for explaining how school-based vision screening may influence refractive error detection among secondary school students in Nigeria. The study will adopt a quantitative quasi-experimental research design. Primary data will be collected from students in selected Nigerian secondary schools using structured questionnaires, standardized vision-screening procedures, and optometric referral and assessment records. A multistage sampling technique will be employed to select states, local government areas, schools, classes, and eligible students. Where feasible, selected schools will participate in a structured school-based vision-screening programme and may be compared with schools without the intervention. Vision screening will be conducted using standardized procedures appropriate for the students' age and setting, including visual acuity assessment and other basic screening procedures as approved by qualified eye-care professionals. Students who fail the screening criteria will be referred for comprehensive eye examination by an optometrist or ophthalmologist, and refractive error detection will be based on appropriate clinical assessment rather than screening alone. Refractive error detection will be assessed using indicators such as the proportion of students screened, proportion failing visual-acuity screening, number of students referred for comprehensive examination, number of newly detected refractive errors, type of refractive error identified, and successful linkage to appropriate eye-care services. Additional information will be collected on students' age, sex, class level, previous eye examination, family history of refractive error, use of corrective lenses, visual complaints, and access to eye-care services. Descriptive statistics will be used to summarize students' characteristics, screening participation, visual-screening outcomes, referrals, and detected refractive errors. Inferential statistical techniques, including chi-square tests, paired-sample tests, independent-sample tests, and logistic or multiple regression analysis, will be used to determine the effect of school-based vision screening on refractive error detection. Where appropriate, detection rates before and after implementation of the screening programme will be compared. Diagnostic tests will also be conducted to assess the reliability of the research instruments, model assumptions, goodness of fit, multicollinearity, and robustness of the findings. The study is expected to find that school-based vision screening has a significant positive effect on refractive error detection among secondary school students in Nigeria. Students who participate in organized school-based vision screening are expected to have a greater likelihood of identifying previously undetected visual problems and receiving referral for comprehensive eye examination. The screening programme is expected to identify students with reduced visual acuity who may have myopia, hyperopia, astigmatism, or other visual conditions requiring further assessment. Conducting screening within schools is also expected to reduce barriers associated with travelling to eye-care facilities and increase awareness among students, parents, and school authorities regarding the importance of regular eye examinations. However, screening alone does not provide a definitive clinical diagnosis of refractive error. The effectiveness of the programme will therefore depend on appropriate referral, parental involvement, access to qualified eye-care professionals, affordability of comprehensive eye examinations, availability of corrective lenses, and follow-up after detection. Consequently, school-based vision screening should be integrated with referral and treatment pathways to maximize its public health benefit. The study is expected to contribute to the literature on school-based vision screening, refractive error detection, adolescent eye health, school health, optometry, preventive healthcare, visual impairment, and public health in Nigeria by providing empirical evidence on the effectiveness of bringing vision-screening services closer to secondary school students. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, Federal Ministry of Education, state ministries of health and education, school management authorities, optometrists, ophthalmologists, school health coordinators, public health practitioners, parents, non-governmental organizations, development partners, and policymakers regarding strategies for improving adolescent eye health. The study will also provide evidence-based recommendations for establishing regular school-based vision-screening programmes, strengthening referral and follow-up mechanisms, increasing parental awareness and participation, improving access to affordable eye-care services, providing corrective lenses for students who require them, and promoting early identification and management of refractive errors among secondary school students in Nigeria.

Keywords: School-based vision screening, refractive error detection, secondary school students, Nigeria, eye health, adolescent health, visual impairment, myopia, hyperopia, astigmatism, school health, optometry, preventive healthcare, public health.