NIDEK CO.,LTD. Research and Development of the Total System We have developed a system that consists of an extraocular device that transmits power and data by wireless communication, and an intraocular device that receives the power and data from the extraocular device. This then delivers electrical stimui to the retina. Two methods of radio communication, RF communication and infrared communication, are selectable. We have verified that the internal circuit operates to facilitate power transmission although the extra- and intraocular devices are located about 2 cm apart. As the actual intra- and extraocular device operation has been verified to be normal, data transmission is accomplished. Each block of the designed IC was verified to be able to perform its task in accordance with specifications. We then incorporated the IC into the intraocular device, and have also verified that the circuit operates normally at a systems level. Two types of microelectrode array have been fabricated: One is a tied bundle of platinum wires embedded in a silicone tube, and the other is a platinum microelectrode array on a polyimide substrate forming thin layers. Both arrays have been verified for normal operation in normal saline solution in an evaluation experiment. We continue research and development to bring the suprachoroidal-transretinal stimulation method into practical use, aiming for further improvement in safety, durability, and practicality.