The device primarily served as a source of entertainment. Placing each image directly in front of the eye with a nosepiece divider in between helped ensure that each eye saw only one image. Wheatstone used lenses to make each image appear larger and farther away. (Because photography wasn’t a viable technology until 1839.) The first working model used line drawings instead of photographs. That’s why Sir Charles Wheatstone invented the Stereoscope in 1838. Image credit: Joaquim Alves Gaspar, Creative Commons 2.5 Each one must be taken at the correct angle to accurately reproduce the experience of looking at the world with two eyes. The pair of images is known as a stereogram. By presenting one image to the left eye, and one to the right, stereoscopy tricks the brain into seeing a 3D image. Stereoscopic technology creates the illusion of 3D depth using a pair of 2D images. Several toy companies have produced variations of this toy over the years. The View-Master brought stereoscopic technology to the toybox with round disks of film that children could click through to view 3D images. That trick is what makes red and blue 3D glasses, those View-Master toys you had as a kid, and the more advanced technology of VR feel real. It turns two slightly different views into one 3D image. Every time you look at something, your brain performs a magic trick. That means each eye projects a subtly different image back to your retina. In reality, each of your eyes sees from a slightly different angle. Because our eyes are positioned side-by-side, our brains are able to combine that input into a single image. That means most people view the world through two eyes.
And the history of this technical magic trick starts long before the digital age.
It’s all possible thanks to stereoscopic technology. Just put on a headset and you’re suddenly somewhere else. You can use it to play games, teach technical skills, or present experiential marketing campaigns to customers. Virtual reality technology is getting better and more accessible.
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