Researchers have found a correlation between the watching of 3d video and fatigue, physical discomfort, and problems with sight. Both near and far would 3d viewers experience any problems. The study was limited by design.
The scientists were 24 people watching 2d and 3d images, after which via a number of questions, it was determined what the physical discomforts were. Moreover, the symptoms in viewing 2d – and 3d-image are compared with each other. The results show that the subjects, on average, more discomfort is experienced as they move into a 3d image look. At a short distance to the screen to make objects for the display have been posted for more eye problems than when the 3d object behind the screen was placed. Interestingly enough is that at long distances the other way around.
In the study looked at participants at a screen where dots were shown. It was the distance to the screen varied, and was there in half of the experimental conditions, a 3d image is displayed using a lens that the optical distance can be manipulated. It knew the researchers in advance what is the difference between the actual distance of the user to the screen, and the manipulated optical distance that a 3d image would create. The eye should be in the 3d-image at different distances to be focused by the eye: the distance to the screen, and the distance at which the 3d image for the user was displayed.
The question is the extent to which the research representative is for viewing 3d video. There were only 24 people used for the research, and in addition, a different experimental procedure to how people normally go to 3d movies. Although the study scientifically demonstrated that there is a correlation between 3d and eye problems, seems more research is needed to determine the extent of this in daily practice is a problem.