How do 3D glasses work and what’s the history?

Charles Wheatstone (1802-1875) a British scientist applied principles of stereopsis, the ability to perceive depth, to create the first 3D viewing device: the stereoscope. Sir David Brewster (1781-1868) a Scottish scientist later streamlined it and what resulted was the world’s first portable, 3D viewing device – the lenticular stereoscope! Like a pair of binoculars, these could be easily wielded by viewers to see eye-popping 3D images.

The earliest confirmed 3D film shown to an out-of-house audience was The Power of Love, which premiered at the Ambassador Hotel Theater in Los Angeles on 27 September 1922.The camera rig was a product of the film’s producer, Harry K. Fairall, and cinematographer Robert F. Elder.

It all depends on the general perspective you see an object. While seeing an object the right side of your eye sees the object in one angle and the left side with some different angle to see the same image, if in case you want it in the practical terms just close one of your eyes and see any object and repeat it for the other eye, you will see both your eyes look at the same object in two different angles.

Now after getting two different images, actual magic happens in your brain, the brain combines both these images and makes it one. This gives you a feel that the image has some depth in it. Seems perfect till here, But when coming to some cinemas or TV’s how do they create the same 3-D effect when the image that is displayed on the screen is 2-D or linear?

Simple, when they shoot some 3-D movies they shoot in 2 different angles. Where in one is intended for one eye, and the other angle is intended for other eye. The glasses that you wear has some filters to differentiate which angle is for which eye and which is for the other. You are ultimately fooling your brain that you are seeing some depth in the 2-D image, because each of your eye is seeing it in different angle.

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