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A group of Japanese home electronic companies have warned viewers about the health risks of 3-D films, saying it could lead to dizziness, nausea and tired eyes. The consortium includes renowned companies such as Toshiba, Sharp and Hitachi . "We do not think this will be a big problem for the majority of viewers but we must warn people that it is possible," the Telegraph quoted Koichi Imai, a spokesman for the consortium, as saying. He added: "We are making the handbook available to cinemas and stores where 3-D products are being sold and the simplest thing is for anyone who feels at all unwell to stop viewing the images." However, Imai said they didn't know how many people could be affected as the 3-D industry was just beginning to grow. 3-D works by displaying a slightly different image to each eye via a filter system, operated by special glasses, alternately shuttering each eye's line of sight and giving the impression of depth to the screen. The 3-D Consortium advises viewers to sit well back from the screen - about three times the height of the screen. It is also recommends that anyone unable to perceive the 3-D effect should stop watching.

Japanese companies warn viewers over health risks of 3-D films