Loss to Follow-up in PDR Patients

Inclusion Criteria: * included treatment-naïve patients who had developed PDR in one eye with a best corrected visual acuity (BCVA) ranging from 20/22 to 20/69, as determined by the Snellen equivalent. Patients were allocated to receive PRP, IVIs of anti-VEGF, or a combination of both procedures. Exclusion Criteria: 1. patients receiving follow-up ophthalmic care for their PDR with or without interventions at any other medical care provider during the observation period, as declared by the patients at any follow up visit. 2. patients LTFU who did not resume follow-up until the end of the observation period. 3. patients needing PPV at first presentation or having additional retinal pathology. 4) patients receiving their treatment procedure during December 2017 or having vitreous hemorrhage that failed to clear up by June 2018 but still ineligible candidates for PPV.