Portable devices in ophthalmologyReply: portable devices in ophthalmologyDiabetic retinopathy screening and the COVID-19 pandemic in BRazilDiabetic retinopathy screening in urban primary care setting with a handheld smartphone-based retinal câmeraThe feasibility of smartphone based retinal photography for diabetic retinopathy screening among Brazilian Xavante IndiansThe English National Screening Programme for diabetic retinopathy 2003-2016.