INS and retinal disorder: Diabetes-related outcomes spanned prevalence estimates (n = 29), glycaemic control metrics (e.g., HbA1c, fasting glucose) (n = 73), medication adherence (n = 28), insulin therapy (n = 19), treatment cost assessments (n = 9) self-care behaviours (n = 17), knowledge (n = 12), and complication assessment (e.g., diabetic ketoacidosis, retinopathy, nephropathy, cardiovascular comorbidities) (n = 101).