Cross-Eyed Technique

Unaided stereovision of stereograms is accomplished through the "Cross-Eyed Technique".
That can be achieved with the naked eye - that is without the aid of a viewer or any other special device.

This technique involves crossing one's eyes (squinting), so that the lines of sight of the left eye is intersecting those of  the right eye.

Approach to the "Cross-Eyed Technique" :
> The distance between your eyes and the screen will depend on the size of the 3D-images on your  screen (distance might  be 1 - 3 ft / 0.3 - 1 m ).
> First hold your finger or a pen halfway between your eyes and the screen and look at the tip of the object.
> Then gradually move your finger or the pen towards your eyes. When the correct position is reached, you will see exactly three blurred images in the background.
> Try to focus at the one in the middle and remove the object slowly from your field of vision. A three-dimensional image should come into view.

  As focusing of the eyes must be intentionally separeted from their viewangle some time for training might be necessary. Try to keep your eyes as relaxed as possible. After short practice you will not need the help of objects like your finger or a pen to support three-dimensional view of 3D-images anymore.

Three-dimensional sight of images can only  be achieved if eyesight of both eyes is sufficient.

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created : 9.4.2000 - updated : 14.12.2021   -  © Th.Gramanitsch