Humans perceive the world in three planes: height, width and depth.

Thus, when observing an object, we can appreciate all its dimensions; however, when looking at an object printed on paper we only appreciate the first two. The brain is able to make an adjustment between the 3 planes captured in an image, so the angles, contours and shadows allow a vision known as stereoscopic vision.

3D technology is applied both in print, paint and photography as well as video games, film and what has been great is that it is used to detect some visual disorders at an early age, such as strabismus.

To achieve this, the first techniques consisted of goggles with slits that allow capturing light differently in each eye in a diagonal fashion and so giving your brain the information needed to generate a 3D view.

Over time it evolved to glasses with different color on each lens, one red and one blue in order to capture the images projected with different colors allowing the brain to interpret the differences in each eye and thus apply depth which gives the illusion of seeing an object out of the screen.

Technology has advanced by alternately projecting different perspectives that are captured by the projector-synchronized glasses so that each lens becomes opaque or transparent at high speed, always ensuring that each eye receives the same perspective. These glasses are known as active glasses.

Today, the feeling of three dimensions in digital TVs is produced using a circular polarization (right and left); this solution is very practical because all you need to enjoy 3D vision is polarized glasses.