The problem lies with the fact that 3D TV continues to work on the basis of each eye seeing the same image from a different viewpoint, creating an illusion of depth.
EFFECT:
That upsets the balance in the eye by which the eyeballs move inwards or outwards to narrow or lengthen the distance of focus, while the lens of the eye changes shape to focus light onto the retina. That works seamlessly with most imagery (including, of course, real three-dimensional objects.)
With 3D TV, the eyeball moves to focus on where the viewer perceives the object to be, while the lens must remains the same shape, targeted on the light of the screen, to avoid blurring.
Television appears to make things worse partly because the viewer is closer to the screen, and partly because television watchers are more likely to be watching for a lengthy session. Animation doesn’t cause as much of a problem, mainly because it can be specifically created for 3D, but live action such as fast-paced sports events can be problematic.
The good news is that the problem looks unlikely to be both severe and widespread. It seems that only 10 to 20% of people will find it a serious problem, made up mainly of those who have a below-average ability to process artificial 3D imagery, but still have enough ability that they can see the effects.
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