vectogram

A polarized stereogram that presents a different image to each eye, allowing for the perception of depth. It consists of two photographic images printed on opposite sides of a transparent film, with their axes of polarization oriented at right angles to each other. When viewed through polarized filters, each eye sees only one image. Vectograms are commonly used in vision therapy to improve binocular vision skills, including convergence, divergence, and stereopsis.