How do stereograms work?

Answer 1

They produce a Three D or (stereo) Illusion with converging visual images and usually employ two cameras (and in the case of films Projector ) often special glasses are needed for spectators, if you wear regular specs, this can be a problem. The Eyeglass angle naturally led to the idea that such things-Three-Dimension films, etf posed visual hazards and this was a potent argument against them, nobody wants to Go Blind from watching movies! There were a number of inventors, the British had one in the nineteenth century, Justice Oliver Wendell Holmes was involved with the Stereoptikon, which he refused to commercialize, the modern View-Master came out in the fifties, and used three reels ina basic set in part suggesting the name-like Ring- Master but with three reels rather than rings- Circus acts were figured as were amusment parks. Zeiss made a stereo camera- stereo Palmos with automatic geared parallax correction, it was two bellows cameras in paralell, way back in l902-06 and it was phased out around l9l2/ Does that answer your question?

Answer 2

There's two kinds of stereograms. Wall-eyed ones, and cross-eyed ones. I find cross-eyed ones easier because you cross your eyes until the two pictures merge. Wall-eyed ones you try to focus you eyes on a point further than the screen (or piece of paper). That is look past the actual stereogram. Some people do this by holding the paper close to their eyes and moving it slowly back.