Here. Roger Ebert had a great piece on why 3D has its health problems.
Hey, man, look at us! We did it! You provided me with evidence and it changed my mind! *birds sing, rainbows dance across the clear, blue sky*
"We can do this. 3D films would not work if we couldn't. But it is like tapping your head and rubbing your stomach at the same time, difficult. So the 'CPU' of our perceptual brain has to work extra hard, which is why after 20 minutes or so many people get headaches. They are doing something that 600 million years of evolution never prepared them for."
That's what I was looking for. An explanation with face validity... not just "it's more strenuous!... cuz it is!" which is all I'd ever heard. Great find, broodwars!
My responses to the rest of the article would be:
1. He's right about any 3D that requires glasses. It's (SO MUCH) darker, and alienating. I will never willingly attend one again and as someone who wears corrective glasses, I look forward to that awkward glasses-on-glasses action disappearing from theaters entirely.
2. The only drawback still present in the way the 3DS handles 3D is that demand on our brain's "CPU." However, mathematically they would have to be less severe than the 3D movies discussed in the article. Instead of our eyes/brains grappling with differences in triangle lengths of 10' - 120', we're dealing with lengths of, what, 6" - 36"? Less, mental gymnastics should decrease the frequency/severity of strain, no?
... and of course, the inclusion of the 3D slider means you can always turn it down, or off.
3.
I can't believe I didn't make this connection this before, but, the way the article described the issue as being more of mental strain than physical (eye) strain, I realized that as I get closer to sleepy time, I tend to turn the 3D slider down! In other words, as my mind becomes fatigued later in the day, it becomes harder to find the mental strength required to accomplish the "work" described in the article! I never get headaches, but I just "don't feel like it" - it must be too mentally demanding at those times!
Look at all this learning!
This also makes sense for why they make a big deal about kids whose eye/mind connection may still be developing.
It could potentially be like having a kid learn to walk with weights on his feet. Ultimately not a big danger, but a developmental hindrance.
4. Also, really, anyone who has this issue... even if this is the proper explanation... it's not that your mental CPU is "weak," rather, as he described, it's like patting your head and rubbing your stomach - it's a very specific skill that everyone will be more or less adept at. Some people are dumb as a brick but they can quarterback a professional football offense. Some people can solve complex physics problems but don't know how to tell a joke, etc ...
I've never had a problem with 3DS, but if I try to read in a car I get nauseous ... I'm sure it's a very similar principle: optical processing with added difficulty (moving car). But no one thinks it makes me stupid or books dangerous...... right?
@Caterkiller3D movies (with glasses) just suck... who cares about the headache, the payoff just isn't good!