Contact lenses are provided for ocular iontophoretic therapy. Implementations include a reservoir adapted to contain a charged therapeutic compound, a current source providing iontophoretic current to the charged therapeutic composition to affect delivery of the charged therapeutic composition into an eyeball, and a sensing circuit controlling the current source to maintain a selected pH range of the charged therapeutic composition. Alternate embodiments include active, sacrificial electrodes for generating ions sufficient to provide electromotive repulsive force to the charged compound to effect transport into ocular tissue.