In 1981, Bath began working on her most well-known invention: the Laserphaco Probe (1986). Harnessing laser technology, the device created a less painful and more precise treatment of cataracts. She received a patent for the device in 1988, becoming the first African-American female doctor to receive a patent for a medical purpose. (She also holds patents in Japan, Canada and Europe.) With her Laserphaco Probe,