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New glasses developed by biomedical engineers at Washington University, use virtual reality to light up tiny tumor cells that may go undetected by the naked eye and it basically shows surgeons where exactly the tumor is. It allows them to directly visualize tumors while they're doing the surgery. A white LED light allows the surgeon to see a normal image. A near-infrared light makes the dye in the cancer cells glow and both these signals are captured by the camera here that sends the information to the waist pouch, which does the processing. The glasses have been tested on people with breast and skin cancer and in animal studies with pancreatic and brain cancers.