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Originally Posted by Sirtel
Umm... that's one of the weirdest things I've ever heard. Why would you do that?
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Certain variations of lazy eye / squint might be the reason. The fake 3D using stereovision doesn't work well for almost 20% of people because they are not normally using their eyes at the same time. It's usually unconscious. One test is a box and a big dot. Draw box about 1.5 cm square. Put big dot about 3 cm from edge to the right or left. Move paper towards eyes. Dot should move (or even "jump") into the middle of the box. If box or dot vanishes, then one eye is dominant. If you can see either, but only one at at time when the paper is close then you don't have stereo vision.
About 20+ years ago I started getting terrible headaches. It turned out that I was compensating when reading books by holding them further off, but all day at laptop screen was a problem. Reading glasses solved the issue. My eyes also don't use the same power of lens, so with the reading glasses I have stereo vision. I've never had it for further off stuff. I did have corrective surgery as a very small child on one eye (the lazy eye) as I tended to have a squint. Then a year of a patch on alternate eyes. You can go blind in a lazy eye.