Abstract
BackgroundThe provision of eye care services is currently insufficient to meet the requirements of eye care. Many people remain unnecessarily visually impaired or at risk of becoming so because of treatable or preventable eye conditions. A lack of access and awareness of services is, in large part, a key barrier to handle this unmet need.ObjectiveThis study aimed to assess whether utilizing novel smartphone-based clinical algorithms can task-shift eye screening to community volunteers (CVs) to accurately identify and refer patients to primary eye care services. In particular, we developed the Peek Community Screening app and assessed its validity in making referral decisions for patients with eye problems.MethodsWe developed a smartphone-based clinical algorithm (the Peek Community Screening app) using age, distance vision, near vision, and pain as referral criteria. We then compared CVs’ referral decisions using this app with those made by an experienced ophthalmic clinical officer (OCO), which was the reference standard. The same participants were assessed by a trained CV using the app and by an OCO using standard outreach equipment. The outcome was the proportion of all decisions that were correct when compared with that of the OCO.ResultsThe required sensitivity and specificity for the Peek Community Screening app were achieved after seven iterations. In the seventh iteration, the OCO identified referable eye problems in 65.9% (378/574) of the participants. CVs correctly identified 344 of 378 (sensitivity 91.0%; 95% CI 87.7%-93.7%) of the cases and correctly identified 153 of 196 (specificity 78.1%; 95% CI 71.6%-83.6%) cases as not having a referable eye problem. The positive predictive value was 88.9% (95% CI 85.3%-91.8%), and the negative predictive value was 81.8% (95% CI 75.5%-87.1%).ConclusionsDevelopment of such an algorithm is feasible; however, it requires considerable effort and resources. CVs can accurately use the Peek Community Screening app to identify and refer people with eye problems. An iterative design process is necessary to ensure validity in the local context.
Highlights
BackgroundIt is estimated that 216.6 million people globally are visually impaired, and 36 million are blind [1]; about 90% of them live in low- and middle-income countries [2]
We initially adopted the signs and symptoms used in a study that predicted eye conditions requiring referral in Rwanda, Madagascar, and Malawi [30], and incorporated the process used in developing the World Health Organization (WHO) clinical algorithms for primary health care (PHC) as a starting point for the design of our algorithms [22]
During the training of the community volunteers (CVs), automated referral decisions were generated by the app for 59 participants, which were used to assess interrater agreement between the reference assessor and the CVs
Summary
BackgroundIt is estimated that 216.6 million people globally are visually impaired (visual acuity in the better eye
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