The invention provides a sustained release intraocular drug delivery device comprising : (a) a polymeric matrix core into which at least one therapeutic agent is mixed, and； (b) a polymeric coating completely surrounding said polymeric matrix material ； wherein said polymeric matrix core and polymeric coating are insoluble and inert in ocular fluids, and wherein said sustained release intraocular drug delivery device has a compliant annular segment shape and is to be inserted into the sulcus of the intact and/or pseudophakic eye.
