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Purpose: To develop and implement mechanisms to collect, report, and assess the World Health Organization (WHO) core eye health indicators in Chile, Honduras, Mexico, Peru, and Uruguay. Methods: Simple templates for a situational analysis (of data collection and reporting processes), a national data collection strategy, and a national work plan to implement the core eye health indicators were developed. Public and private sector representatives from the ministries of health (MOHs), national vision committees, and national societies of ophthalmology of each country used these tools with 2013 baseline data to improve their data collection processes and collected 2015 data. Final analysis and cross-validation were performed using intraocular lens sales data and last observation carried forward imputation. Results: Study tools were effectively implemented in all five countries and resulted in improved intersectoral stakeholder collaboration and communications, which improved the data collection and reporting processes. More complete and accurate data were reported by 2015 compared to the 2013 baseline. Conclusions: Multisectoral stakeholders, including national professional societies and national vision committees, should collaborate with MOHs to improve the quality of data that are reported to WHO. This study involved these stakeholders in the data collection processes to better understand the realities of indicator implementation, better manage their expectations, and improve data quality. WHO Member States across the globe can feasibly adapt the study tools and methodologies to strengthen their data collection processes. Overall, the reliability and validity of the indicators is hampered with limitations that prevent fully accurate data from being collected. [ABSTRACT FROM AUTHOR]