Although eye puzzles, like those created by Magic Eye, were at the peak of their popularity in the 1990s, they still exist today. Test out your knowledge of this primitive 3-D technique with our eye puzzles quiz.
Although 3-D illusions got their start way back in the 1800s, eye puzzles weren't created until 1959 when random-dot stereoimages were invented as part of a depth perception experiment.
There are many ways to solve an eye puzzle. Viewing techniques vary. You have to choose the right one for you.
Viewing eye puzzles involves depth perception, so people with a lazy eye, loss of vision in one eye or depth perception issues may not be able to view them.
Some doctors use eye puzzles as part of vision therapy, since the process of viewing them relaxes the eye muscles.
All of these conditions may prevent someone from viewing an eye puzzle.
Even though your mother warned you against crossing your eyes, it is actually one of the techniques suggested to help solve eye puzzles.
If you are near-sighted and remove your glasses, you will be able to see the eye puzzle more quickly.
The stereoscope allowed users to view two flat images, side-by-side, in 3-D form.
Some vision issues may prevent you from seeing eye puzzles, but perfect vision is not required.
Autostereograms were invented in 1959 by Dr. Bela Julesz. Magic Eye didn't create their version of eye puzzles until 1991.
One method involves getting so close to the eye puzzle, your nose touches it. Then you slowly pull back from the image while keeping your eyes un-focused.
Eye puzzles are actually used by some doctors as part of vision therapy.
Viewing eye puzzles can often be beneficial because to see them, you must relax your eye muscles.
Eye puzzles, known as autostereograms, consist of just one image.
3-D images are not produced in your eye, but in the brain.
Healthy vision in both eyes is the only thing you need to solve an eye puzzle.
Dr. Bela Julesz discovered single image stereograms, the predecessor to eye puzzles, while trying to uncover camouflaged objects from aerial spy plane photos.
There are three different types of single image stereograms including random dot, random text and texture.
Those with lazy eye will have extreme difficulty viewing eye puzzles. However, some doctors claim the practice of viewing eye puzzles may improve the condition.
Although it is the most difficult, the parallel viewing method -- staring through the image as if it's not there -- is the recommended technique.