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A series of implants for intraocular and/or intraorbital use are provided which permit the controlled release of pharmacological agents. The implants are substantial C-shaped rings and are insertable through incisions made in the eye wall or are sutured around the globe of the eye. The C-shaped rings may be formed from the biodegradable polymers so as to release a drug as the polymer biodegrades or the implant may be in the form of a hollow flexible polymeric cocoon with the drug disposed therewithin for slow release by osmosis.