The term “3D” is venerable but ambiguous. It can be confusing to viewers, referring to a broad range of technologies, many of them unrelated to depth perception.
Unlike motion, sound, color, and HD, current 3D TV systems do not generally provide more information to viewers, just a sensation of depth, varying with screen size, viewing distance, and pupillary distance of the viewer. Under some conditions and for some viewers 3D can cause visual discomfort.
An understanding of the different meanings and technologies of 3D can help reduce viewer problems and confusion. Future 3D television technologies may be very different.