Optic　disc　(OD)　localization　is　an　essential　step　of　developing　computer-assisted　diagnostics.　In　this　paper,　we　present　a　fast　and　robust　method　to　locate　the　OD　center　in　digital　retinal　images.　The　horizontal　and　vertical　location　of　the　OD　are　be　detected　respectively,　using　two　main　features　of　the　OD,　vascular　direction　and　intensity　variance.　Four　public　datasets,　including　89　normal　images　and　251　diseased　images,　were　used　to　evaluate　the　performance　of　the　proposed　method.　The　success　rate　is　96.6%　with　an　average　computing　time　of　1.3　s　for　each　image.　©　2013　IEEE.