The indirect ophthalmoscope with upright image further includes Schmidt prisms, a right positioned plane mirror, and a left positioned beam splitter.

This effect gives a sensation of speed in the image where it is applied.

It involves pressing an ultrasound probe with gel onto the surface of the skin to generate an image in the desired position.

If the image layer facing the viewer is still intact, which is to be expected in most cases, the black backing can be replaced.

The perforation pattern is herein formed such that, for instance when the thus treated document is held up to the light or placed on a light box, an image becomes visible at the location of the perforation pattern.