In in astronomy, they used to use a similar technique to 'spot the difference' between photographs of the night sky to find moving objects. They used a special stereo microscope that would place one image in front of each eye. The images were of the same part of the night sky, but separated by time. I saw one recently at the Palomar Observatory. Here is a more elaborate one from the National Air and Space museum: https://airandspace.si.edu/collection-objects/microscope-ast...