A medical device for use on the human eye is described. The device is
placed in an extrocular location in a patient and delivers an electrical
current that stimulates the retina of patients who are blind or have
vision disorders. It has at least one electrode that makes contact with
the scleral surface of the eye, the electrode typically being activated
by an electrical stimulator. The device produces electrical pulses which
pass through the electrodes on the scleral surface of the eye, to
activate the retina of the eye, which causes the patient to experience
improved vision, visual sensations or the prevention of deterioration of
vision. By this means, sight can be restored or improved where patients
have disorders of their retina or other parts of their visual system.