Related to Rotating Binocular Lamp
Description:

Whilst no elements of the stereoscope were incorporated into the binocular lamp, both tools were designed for the study of the process of binocular vision, and to acheive this through the inducton of visual effects.

The principal difference between the two tools lies in the ways in which the respective visual effects of each tool are induced. Whereas the stereoscope constitutes a means by which differring images can be placed in the field of vision of each eye as a whole (threreby projecting contrasting images onto the whole retina of each eye), the binocular lamp creates conditions in which it becomes possible to project light (rather than images) onto a specific part of each retina. Further, whereas the stereoscope relies on constant illumination to transmit the images presented, the rotation of the binocular lamp interrupts the transmission of the source of illumination.

In the decades following its invention, the stereoscope was appealed to by those who sought to bring the processes that underlie depth perception into question. Developed more than sixty years after the stereoscope, the lamp constituted a means by which a perceptual phenomena that had hitherto been considered separately from depth perception questions - visual 'flicker' - could be brought to bear on the debate that surrounded stereoscopic effects.