MicroDicom is free for non-commercial use. If you are a medical student, you can use it for free. When you run it for the first time, it will ask you to register MicroDicom. Select the desired option.
Human 3D vision is based on parallax: each eye captures a slightly different perspective of the world, and the brain fuses these two views into a single, rich 3D perception. Glasses-free, or ...