Methods of assessment of diabetic retinopathy in low- and middle-income countries: a protocol for scoping review

Abstract

INTRODUCTION: Globally, over a hundred million people are estimated to suffer from diabetic retinopathy (DR), which is a major complication of diabetes mellitus (DM). The prevalence of DM is projected to increase from the current 537 million by almost 50%, to 783 million by 2045. As a result, DR is one of the fastest rising causes of preventable blindness. Three out of four people suffering from DM live in low- and middle-income countries (LMICs), where resources for both diagnosis and treatment are lacking. There has been a reduction in the rate of blindness from DR in high-income countries, while an opposite trend has been noted in LMICs, contributing to this massive morbidity burden. This scoping review aims to ascertain the methods used to assess DR in LMICs. METHODS AND ANALYSIS: The scoping review will adhere to the Preferred Reporting Items for Systematic Review and Meta-Analysis extension for Scoping Review (PRISMA-ScR) guidelines and the Arksey and O'Malley (2005) methodology framework. A systematic search of peer-reviewed literature will be carried out for all papers up to 15 May 2025 by identifying studies from electronic databases, including Embase, Medline and CENTRAL (Cochrane Library). A hand search of the associated reference lists of included studies and grey literature will also be conducted. The identified studies will be screened based on agreed eligibility (inclusion/exclusion) criteria by two independent reviewers, with any disagreements resolved via arbitration from a third reviewer. The data will be thematically summarised according to different aspects of DR assessment methods, and key findings will be elicited. The key findings will provide a comprehensive and clear understanding of the assessment methods used to identify DR in LMICs. ETHICS AND DISSEMINATION: Ethical approval was not sought for this work as only publicly available information is used. The results will be disseminated through a peer-reviewed publication, conference presentations and meetings with stakeholders.

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