An eye expert from the University of Sydney's Vision Centre said Wednesday that watching 3D TV for a few hours each day will not damage the eyes nor affect one's depth of perception.

Professor Colin Clifford explained that the brain is capable of focusing on the tiny screens in virtual reality goggles used to watch 3D movies.

The human visual system responds to a great many different cues in order to interpret the depth of what it is seeing, so it is not likely to be confused by a single cue - a 3D picture which is in fact being projected on a flat screen, Clifford said, according to

Some experts have warned of health risks associated with prolonged watching of 3D TV saying depth perception is altered for hours after the 3D glasses are taken off leading to accidents. In fact, safety guidelines in watching 3D TV warns that it is not suitable for the drunk, pregnant, elderly, epileptic and sleep deprived.

While VR goggles send different signals to each eye causing conflicting depth perception cues, the brain's processing system can still properly interpret the images as long as the 3D TV is watched from a normal viewing distance of two to three meters, Clifford said.

For young 3D viewers, Clifford warns against excessive watching from close range.