Because of the lack of success in using the one color assumption when trying to solve the problems associated with visual dyslexia many researchers now believe that there is not a visual component to dyslexia. That belief is similar to throwing the baby out with the bath water. Let's look at the one color assumption. This color is the answer for one dyslexic. Another color is the answer for that dyslexic . A third color is the answer for a third dyslexic. When you have the one color assumption as the solution and you test one color at a time you will find one color that the dyslexic prefers most as helping that dyslexic to read best.
That some dyslexics describe problems that involve moving and obscured print that makes reading difficult is not in question. That dyslexics have a statistically higher rate of poor depth perception also seems to be true. These problems seem to involve vision and could be called visual problems. The failure of the one color assumption is just that, the failure of the one color assumption. The poor quality standard for the one color assumption is also at fault. What is determined is which color is preferred most. It is never determined that the dyslexic's problem is removed just what color is preferred.
Let's consider also the method used in finding the best color for a dyslexic. Does the dyslexic go right to the color and say this is the preferred color or are other colors picked as the preferred color along the way? What happens to those intermediate colors that seemed at one point to be the most preferred color? They are discarded as not being important. If the quality standard was instead of finding the most preferred color was the removal of the dyslexic's visual problem the testing might have to continue. An obvious way to continue would be to go through the whole process wearing the preferred color and seeing if any secondary color added to the most preferred color would be more effective. This could be continued until no more improvement is seen but this doesn't happen because of the one color assumption.
Many people do not notice that the one color assumption is actually two assumptions. The first as I discussed earlier is that one color will be the answer to the dyslexic's visual problem. The second assumption is that the answer will involve color. This might seem reasonable at first as that takes in the whole visible spectrum and visual problems should be in the visual spectrum shouldn't they? Well, I guess visual problems should be in the visible spectrum but that doesn't mean that the problem doesn't start outside the visible spectrum.
I suspect that some readers are scratching their heads right now because they didn't consider phase shifting light into the visible from outside the visible. This need some explaining so here it is. The eye has many different proteins that have the ability to phase shift light mostly from UV to visible. This phase shifting can also occur from one color to another as well as a 2 photon shift from IR. This is called autofluorescence and occurs in every part of the eye. Some autofluorscent proteins are even known to migrate up and down the cones of the eye.
What is suggestive about autofluorescence as being involved as a mechanism for visual dyslexia is that the phase shifted photons are no longer on their original path and because of this causes visual noise.This effect has been documented in the eye but as yet not associated with visual dyslexia by the scientific community. At this point I cannot determine if visual dyslexics have a larger amount of autofluorescent proteins causing more visual noise or if they have a higher sensitivity to the visual noise or perhaps both.
What I do know is that filters that filter out the wavelengths associated with autofluorescence as well as yellow light that is associated with glare and other wavelengths that seem to be related to visual dyslexia symptoms will remove any visual problem that is described by a visual dyslexic as making reading difficult 100% of the time.
Granted this might seem like a heavy handed approach when compared to finding that one color that a particular dyslexic prefers. On the other hand by combining the filtration for all the wavelengths of light that can be associated with causing any of the problems for all visual dyslexics the result is that no personal evaluation is needed and rather than finding a preferred color we have See Right Dyslexia Glasses that will remove all the visual problems that make reading difficult for the visual dyslexic. More information about these dyslexia glasses can be found at www.dyslexiaglasses.com