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Effect of School-Based Eye Screening on Amblyopia Detection among Primary School Children in Nigeria

Abstract

Amblyopia, commonly referred to as lazy eye, is an important childhood eye health condition that may result in reduced vision in one or both eyes when normal visual development is disrupted during early childhood. If not detected and managed at an appropriate age, amblyopia may lead to persistent visual impairment and may affect children's educational performance, physical activities, social participation, and overall quality of life. Primary school children represent an important population for early eye screening because visual problems may become apparent during school years, while many children may be unable to recognize or communicate difficulties with their vision. Risk factors for amblyopia may include uncorrected refractive errors, unequal refractive errors between the eyes, strabismus, visual deprivation, and other childhood eye conditions. Despite the importance of early detection, access to routine eye screening remains limited in many communities in Nigeria because of inadequate awareness, financial constraints, geographical barriers, shortage of eye-care professionals, and limited integration of eye health services into school health programmes. School-based eye screening provides an opportunity to identify children with visual abnormalities through accessible screening activities conducted within schools and may facilitate early referral for comprehensive eye examination and appropriate management. Against this background, this study investigates the effect of school-based eye screening on amblyopia detection among primary school children in Nigeria. The study will be anchored on the Health Belief Model, Social Ecological Model, and the Health Systems Framework. The Health Belief Model explains how parents' and caregivers' perceptions of children's susceptibility to visual problems, perceived severity, perceived benefits of screening, perceived barriers, and cues to action may influence participation in school-based eye screening. The Social Ecological Model emphasizes the influence of individual, family, school, community, and environmental factors on children's access to eye health services and preventive healthcare. The Health Systems Framework emphasizes service delivery, health workforce, health information, medical products and technologies, financing, and accessibility as essential components of effective school-based eye screening and referral programmes. Collectively, these theoretical perspectives provide a suitable framework for explaining how school-based eye screening may influence amblyopia detection among primary school children in Nigeria. The study will adopt a quantitative cross-sectional analytical or quasi-experimental research design. The study population will comprise primary school children enrolled in selected public and private primary schools across Nigeria. A multistage sampling technique will be used to select states, local government areas, communities, schools, classes, and eligible children. School-based eye screening will be measured using indicators such as availability of school eye-screening programmes, screening coverage, frequency of screening activities, visual acuity assessment, basic ocular examination, assessment for refractive errors and ocular alignment abnormalities, availability of trained eye-care personnel, screening equipment, parent and teacher eye-health education, and referral arrangements. Amblyopia detection will be assessed using indicators such as reduced visual acuity, inter-eye visual acuity differences, suspected amblyopia, identification of associated refractive errors or strabismus, newly detected cases, severity of visual impairment, referrals for comprehensive eye examination, ophthalmological confirmation where appropriate, and linkage to corrective or therapeutic services. Data will be collected using structured questionnaires, school screening registers, visual assessment forms, eye-care referral records, healthcare facility records, and relevant school health programme documents. Descriptive statistics will be used to summarize children's characteristics, screening coverage, visual assessment findings, and patterns of amblyopia detection. Inferential statistical techniques, including chi-square tests, correlation analysis, and logistic or multiple regression analysis, will be used to determine the effect of school-based eye screening on amblyopia detection. Where appropriate, amblyopia detection rates before and after implementation of school-based eye screening activities may be compared to determine changes associated with the intervention. Diagnostic tests will also be conducted to assess the reliability, validity, and robustness of the findings. The study is expected to find that school-based eye screening has a significant positive effect on amblyopia detection among primary school children in Nigeria. Children who participate in school-based eye screening are expected to have a higher likelihood of having previously unrecognized visual abnormalities associated with amblyopia identified than children without access to routine school eye screening. Systematic screening may facilitate early identification of reduced visual acuity, refractive errors, strabismus, and other risk factors requiring further assessment. Early detection may provide opportunities for comprehensive eye examination and appropriate management, including refractive correction, treatment of underlying ocular conditions, and other clinically indicated interventions. Conducting screening within schools may reduce geographical, financial, and time-related barriers and improve access to eye-care services among children who may not otherwise receive routine visual assessment. School-based eye-health education may also improve parents' and teachers' awareness of childhood visual problems and encourage timely referral and treatment. Conversely, inadequate screening coverage, shortage of trained eye-care personnel, limited screening equipment, low parental participation, financial barriers, and weak referral and follow-up systems may reduce the effectiveness of school-based eye screening. The study therefore expects accessible and well-organized school-based eye screening to contribute significantly to improved detection and early management of amblyopia among primary school children in Nigeria. The study is expected to contribute to the literature on school-based eye screening, amblyopia detection, childhood eye health, visual impairment, refractive errors, school health services, preventive eye care, child health, and public health in Nigeria. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, Federal Ministry of Education, National Primary Health Care Development Agency, state ministries of health and education, primary schools, optometrists, ophthalmologists, eye-care professionals, school health coordinators, parents, development partners, and policymakers regarding strategies for improving childhood eye health. The study will also provide evidence-based recommendations for expanding school-based eye screening programmes, improving access to routine visual acuity assessment, strengthening training and deployment of eye-care personnel, increasing availability of appropriate screening equipment, improving parent and teacher awareness of childhood visual problems, strengthening referral and follow-up systems, reducing financial and geographical barriers to eye care, and integrating comprehensive vision screening into school health programmes across Nigeria.

Keywords: School-based eye screening, amblyopia detection, primary school children, childhood eye health, visual impairment, refractive errors, strabismus, vision screening, school health services, preventive eye care, Nigeria, public health.