Below are a small number of stereo pairs.
#Cross eyed stereogram free#
However, I do not think there has been any systematic exploration of that hypothesis.įor those interested in developing the ability to free view parallel stereo images, this WordPress site: gives both a method for this and lots of other information on 3D. I suspect that individuals with a tendency toward esophoria will find it easier to view images designed for cross-eyed viewing, and those with a tendency toward exophoria will find parallel images easier to fuse. I think this explanation is unlikely because pseudoscopic images are usually obviously just that….weird and unreal, spheres with concave faces, objects with holes in, etc. In that case, the parallel view stereo pairs will be seen as ‘pseudoscopic’ views in which the intended stereo effect is reversed (see post below for more on this). There is another, less likely explanation they are not seeing the 3D image as intended but rather cross-eye view both parallel and cross-eye stereo photographs. They might not be aware that that is what they are doing, their eyes simply adapting to the images in such a way as to provide the best stereo view. First, the viewers might be diverging their eyes in order to see the parallel 3D stereo pairs and crossing them to see the images designed to be viewed cross-eyed. Perhaps I should not have been because there is more than one reason why one might expect that to be so. Ok, so I was surprised that individuals who normally use the ‘cross-eye method’ of viewing reported being able to fuse and see stereo in images designed for parallel viewing. If it is picked up in the first few years of life, and appropriate measure are taken, the prescription of glasses and patching of the good eye thereby forcing the lazy eye muscles to point the eye the right way, then the problems with the musculature of the affected eye can be corrected, and the child will not become stereo blind (amblyopic). Stereo blindness is a developmental disorder. In extreme cases of these types of squint, where one eye is ‘lazy’ and points way off beam, then the individual may develop amblyopia, a condition in which they become stereo blind. Some individuals suffer from “exophoria” (hmmm…not sure they ‘suffer’!) in which the eyes’ optical axes turn outward from one another. However, when totally relaxed or in the absence of visual clues, there is usually some degree of ‘esophoria’ – the optical axes of the two eyes point slightly inwards. Human eyes usually work as a pair and point roughly to the same point in space. The second, has the left eye view on the right, and the right eye view on the left, and can be viewed by crossing one’s eyes. designed for parallel viewing with a Brewster-style stereoscope, or, since some people can do it, free viewing them. The first, has the left eye view on the left, and the right eye view on the right – i.e. First, let’s be clear, there are two ways of presenting side-by-side stereo pictures. I was slightly surprised to learn from some people who have viewed some of my posts on Facebook and here, that they can view 3D photos designed for parallel viewing by “crossing their eyes”.
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