Cyclops is a computer-based technological system (commonly used in professional tennis) uses infrared beams to help in deciding whether a serve is in or out of the service line. This technology was co-invented by Bill Carlton of Great Britain and Margaret Parnis England of Malta in the year 1979. Cyclops has been in operation at major tournaments since it was first introduced at the Wimbledon Championships in 1980. The system has also been used at the U.S. Opens and Australian Opens. Earlier it was like the upside down periscope but later on, it evolved into a five infrared beam electronic system. Since the introduction of Hawk-Eye technology at major events in 2006, use of cyclops is reduced.