The Twilight Zone Where Margins Are Blurred: A Retrospective Analysis of Unilateral and Bilateral Optic Disc Swelling in a Tertiary Center in Malaysia.

Background To analyze the etiology of optic disc swelling (ODS) and compare the clinical features between non-arteritic anterior ischemic optic neuropathy (NA-AION) and optic neuritis (ON) at our center from January 2019 to January 2020. Methodology Clinical records of all patients who presented with ODS between January 2019 and January 2020 were reviewed. The collected data were analyzed using IBM SPSS Statistics for Windows (Version 23.