 Both quantitative and qualitative data were collected for 2 weeks simultaneously face-to-face from the respondents during the camp hours. For the quantitative data, two separate closed-ended structured questionnaires were developed. Information regarding patients demographics and socio-economic status were collected. From the service providers, information on their age, years of working with BRAC, and duration of involvement in BRACs RGIL project were also collected. Their level of knowledge was assessed and scored on several issues for instance, common foreign body and infection related eye problems, and its immediate measures, vision either near or distance related eye issues, presbyopia, its aetiology and certain eye conditions which would require to refer to registered eye specialist. Furthermore, refractionists were present in each camp run by all three providers in the respective arms. All the patients screened under any of the above three arms were then re-examined by a refractionist to confirm the diagnosis of presbyopia and it was recorded in a defined format. The investigators kept blinded each of the refractionists to the screening outcome i.e. the refractionists were not aware of the screening report made by our service providers prior to examining a patient. Background data were collected from presbyopia positive participants only identified by BRAC workers. Data collection was performed by skilled interviewers consisting of science graduates having field experience. A five-day intensive training was organized for them consisting of lectures, mock interviews, role play and field practice in an eye camp. Before the actual survey, the teams were deployed in camps and the participants were informed about the purpose of the study and with their informed verbal consent, the interviewers took information on the camp day. 