I need help remembering the name of an old toy?

over 40 years ago, used to put discs in it and look through the 2 lenses. The slides were great 3D for that time, and you'd change the picture by pushing a slide down the side of the viewer. You could read the story on the discs through the view finders. Was it something like Magic Viewer? I'd love to try to find one for my granddaughter.