The present invention consists of an implantable device with a hermetic electronics package that houses electronics. The hermetic package is attached to a flexible circuit electrode array having its electrodes arranged in a trapezoidal electrode array field that is suitable to stimulate the visual cortex. The hermetic electronics package is provided with a fixation structure that secures, protects and dissipates heat from the electronics package. The entire implantable device can be entirely implanted within the head.