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![]() Another possible cause is convergence. At close range (12-18 inches), your eyes converge an average of 3mm...but this is not so for everyone. Just as you have a dominant eye for distance, you will also have a dominant eye for near. After years of depending on one eye to do the majority of the work, you can depend less on convergence and adaptability. By allowing your eyes to relax, and blur....you attempt to overide your brain's intent, and allow both eyes to be equally dysfunctional. Thus, images begin to overlap and the muscles that control your eyes are less likely to fix at the same point that they normally would. The same people that have problems crossing their eyes...even a little...will have the greatest frustration when attempting to view stereograms. Other conditions such as esophoria and esotropia can cause the eye to move inwards...(commonly called a lazy eye), and exophoria and exotropia (a tendency for an eye to shift toward the temple), will have an impact. I would suggest that people could adjust their distance from the stereogram and have a greater rate of success. A distance that works for the majority, doesn't always work for everyone. And last but not least...I would enjoy the statistics relating the ability of a person to see stereograms with regard to their profession. Analytical/Artistic mindset?
![]() All HTML, and graphics are copyright BJ Boyer, 1999. I did not make the sterograms, nor claim to have. I have just brought them together from various places on the internet. Any questions can be sent to Destiny@spliced.net |