See this quote from a book (if you need the reference I can send it):
"... It should be noted as we wrap up this brief overview of the HVS (Human Vision System) that individuals
vary along a continuum in their ability to process stereoscopic depth
information. Studies have shown that a relatively large percentage of the population
experience stereodeficiencies in depth discrimination/perception if the display
duration is very short, and that a certain percentage of the adult population (about
6%) has persistent deficiencies. Figure 2.8 depicts the results of a study that quantifies
these observations [14]. These results indicate that certain fast-cut methods
in scenes may not work for all in 3D. Object motion can also create visual problem
in stereoscopic 3DTV. Figure 2.9 depicts visual discomfort that has been
observed in studies [14]. At the practical level, in the context of cinematography,
while new digital 3D technology has made the experience more comfortable for
many, for some people with eye problems, a prolonged 3D session may result in
an aching head according to ophthalmologists. Some people have very minor eye
problems (e.g., a minor muscle imbalance), which the brain deals with naturally
under normal circumstances; but in a 3D movie, these people are confronted
with an entirely new sensory experience that translates into greater mental effort,
making it easier to get a headache. Some people who do not have normal depth
perception cannot see in 3D at all. People with eye muscle problems, in which
the eyes are not pointed at the same object, have trouble processing 3D images..."
Therefore even a certain percentage of the general population has issues with 3D
AnnaMaria
