1. National Health and Morbidity Survey 2015 (NHMS 2015). Vol. II: Non-Communicable Diseases, Risk Factors & Other Health Problems;Institute for Public Health,2015
2. Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the right to sight: an analysis for the Global Burden of Disease Study;GBD 2019 Blindness and Vision Impairment Collaborators;Lancet Glob Health,2021
3. Ministry of Health Malaysia. National Diabetes Registry Report 2020. (2020). https.//www.moh.gov.my/moh/resources/Penerbitan/Rujukan/NCD/Diabetes/National_Diabetes_Registry_Report_2020.pdf.
4. National Eye Database. The 11th Report of the National Eye Database 2017. (2017). https.//www.acrm.org.my/ned/NEDreport/NED_report_2017.pdf.
5. Current clinical status and vascular complications among patients with type 2 diabetes mellitus at tertiary hospitals in Malaysia;Tan MC;JAMMR,2014