So because our brains see this difference, then we can estimate how far away things are. So 3D TV works by showing two pictures at the same time, but each picture is delivered to the individual eyes. One of the older ways is with those red-blue glasses called anaglyph, and you put the glasses on and you look at a picture, and part of the picture is in red and one eye will see that, and part of the picture is in blue and another eye will see that. By splitting the picture into the two different colours and wearing the two different coloured glasses, you can have the two different images coming to the different eyes.
Another technique for delivering the different images to the different eyes is to use polarisation in the glasses, so you put the glasses on and one side is polarised horizontally and one side is polarised vertically, and the two images that are presented are also polarised, so the polarised filters mean that the horizontally polarised image is delivered to one eye and the vertically polarised image is delivered to the other eye.
Dr Adrian Dorrington from the School of Engineering at the University of Waikato is conducting research in the field of optoelectronics. His work is involved with finding out how 3D cameras can The miracle of our depth perception comes from our brain's ability to put together two 2D images in such a way as to extrapolate depth. This is called stereoscopic vision. Something to think about: Most predators have stereoscopic vision in order to gauge distance to their prey as they hunt.
Most herbivores' eyes are on the sides of their heads so that they can see as much of their environment as possible. See how the image seems to jump? That's because of binocular disparity , the slight difference between the images seen by each eye. Binocular disparity is one of the most important pieces of information the visual centers of the brain use to reconstruct the depth of a scene.
If the object you're trying to view is close to you, the brain uses another clue: convergence, or the angle of your eyes as you focus on an object. Crossing your eyes will give you an extreme example of the convergence sensation. Stereopsis is the visual ability to see your surroundings in three dimensions 3D , allowing a person to judge the distance between themselves and objects around them.
Poor stereopsis could indicate a serious eye condition, known as Amblyopia lazy eye. Stereopsis and 3D vision are essential for driving, playing sports and contribute to a high quality of life. Depth perception arises from a variety of visual stimuli known as depth cues. They fall into two categories: monocular cues single-eye and binocular two-eye cues.
Fine stereopsis is often what is tested in an eye exam — this is, very fine amounts of depth between objects. The signs and symptoms associated with poor or reduced stereopsis a similar to those of lazy eye and include:. If you or your child experiences any of the above symptoms, contact an eye doctor near you.
A child may have a lazy eye or double vision, impacting their vision of the board, books or other teaching materials at school. Children may not have the ability to articulate their visual problem, or may not know that a problem exists.
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