A retinal implant device to stimulate a retina of an eye thereby producing
a specific effect in an eye, such as vision or drug treatment of a
chronic condition is described. The retinal device is made of a retinal
implant that is positioned subretinally and that contains a multitude of
stimulation sites that are in contact with the retina. A connection
carries the stimulating electrical signal or drug. The connection passes
transretinally through the retina and into the vitreous cavity of the
eye, thereby minimizing damage to the nutrient-rich choroid. The lead is
attached to a source of drugs or electrical energy, which is located
outside the eye. The lead passes through the sclera at a point near the
front of the eye to avoid damage to the retina.