An observer is presented, through a pair of viewing glasses, a field/frame multiplexed, synthesized three-dimensional or stereoscopic image on single monitor generated from a two-dimensional monocular video signal. The field/frame multiplexed, synthesized 3D image is generated in a converter. A controller controls the left and right eye vision of the glasses along an unobstructed path without need of any connecting wires. A wide range of input sources can provide the 2D input video signal for conversion. The resulting synthesized 3D image is especially suited for medical and other purposes which require realistic, accurate and visually comfortable 3D visualization of video images, as for example in minimally-invasive surgery to allow complex navigational and manipulational procedures carried out over a continuous period of many hours. The ability to transform a 2D image from a single source into an accurately portrayed synthesized 3D image displayed on a color monitor is also necessary in related biomedical fields including microscopy, medical telecommunications and medical education.