As for the dyslexic, the blue cones were symmetrical. Scientists believe the identical arrangement produces “mirror” images in both eyes that may confuse the brain. Therefore, there is no dominant eye.
Scientists compared it to being left- or right-handed; humans also have a dominant eye.
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"The lack of asymmetry might be the biological and anatomical basis of reading and spelling disabilities. For dyslexic students their two eyes are equivalent and their brain has to successively rely on the two slightly different versions of a given visual scene," researchers said in a statement.
“Our observations lead us to believe that we indeed found a potential cause of dyslexia,” they said.
However, scientists say it’s treatable, because there is a preventable, minuscule delay that occurs before the mirror images are sent to the brain.
"The discovery of a delay (of about 10 thousandths of a second) between the primary image and the mirror image in the opposing hemispheres of the brain, allowed us to develop a method to erase the mirror image that is so confusing for dyslexic people," the authors said.
By using a "magic lamp," they're able to flash a light into the eye so quickly that it cancels one of the identical images before it reaches the brain.
Despite the findings, more research is needed to ensure the technique works.