Many people complain of headache and uneasiness when watching 3-D movies. If you are one of them, inventor Hank Green has a special pair of glasses for you.
Mr Green hit upon the novel idea that one could easily convert 3-D video into 2-D by simply blocking light from one of the two overlapping images. When his wife confessed that she gets headaches when watching 3D movies, the happy-to-help Mr Green repurposed the 3D glasses by swapping polarising filters and created the world’s first 2D glasses.
Mr Green’ 2-D glasses look like 3-D glasses, only they have the same polarization in each lens, which effectively strips away the 3-D and leaves a 2-D image for you to enjoy without developing a headache. You can buy a pair of these glasses for $8.
When you watch a 3D movie, there are actually two images being projected onto the screen. That’s why the screen is blurry when you look at it without glasses. In 3D glasses one of the lenses blocks one image and the other lens blocks the other image.
Thus, when you watch a 3D movie each of your eyes is seeing a slightly different image. Your brain combines those images together, creating the illusion of a 3D image.
2D Glasses block the same image with both lenses, so each eye gets the same picture resulting in a 2D image and an elimination of eyeball strain.