 Second Sight Medical Products, Inc. NASDAQ: EYES, Lucira Health, Inc. NASDAQ: LHDX and Ra Medical Systems, Inc. NYSE: RMED were among the biggest health care gainers Wednesday. Second Sight Rallies On Positive Results For Visual Prosthesis: Second Sight, which makes implantable visual prosthetics that are intended to create an artificial form of useful vision for blind individuals, announced two-year results for the early feasibility study of its Orion Visual Cortical Prosthesis. 