Ocular implant devices (10, 20, 121) for the delivery of a therapeutic agent to an eye (101, 301) in a controlled and sustained manner. Dual mode and single mode drug delivery devices (10, 20, 121) are illustrated and described. Implants (10, 20) suitable for subconjunctival placement are described. Implants (121, 10, 20) suitable for intravitreal placement also are described. The invention also includes fabrication and implementation techniques associated with the unique ocular implant devices (10, 20, 121) that are presented herein.