Introduction
The
learning disability dyslexia is presently considered a language
processing abnormality typified by phonologic skill disorders (1,2).
A visual origin for dyslexia is not favorably championed (3,4,5).
Visual origins for dyslexia are even less tenable when recent brain
imaging studies demonstrate functional brain regions of decreased
activity in dyslexics (6). There is either an overwhelming research
interest in a phonologic origin or no tangible source lead for
an
ocular motor causation for dyslexia. It is now proposed that dyslexia
is a disorder of stereopsis and functionally correctable. This
report's
intention is to merely give support and credence to a stereopsis
origin for dyslexia and create new interest in an alternative
origin
for the learning disorder as dyslexia.
First, a dyslexic
stereoscopic origin is based upon the combination of a stereoscopic
eye exercise and the coupled necessity to use a new reading focal
point for retinal epipolar line alignment, correspondence. Epipolar
lines are right and left eye retinal regions that decrease retinal
correspondence search for normal stereopsis (7,8,9,10). The second
is through use of a vergence reading arc evaluation as retinal epipolar
line matching areas.
On downward
gaze cyclovergence produces inward rotation, nasally directed,
and
on upward gaze cyclovergence rotation is outward, laterally directed
(8). Since dyslexics are effectively treated with a stereoscopic
eye
exercise and reading method (11), advantage of this change, from
inward rotation to outward rotation on vergence change from
downward
gaze to upward gaze, presents a mechanism for further demonstrating
that dyslexics need only to attain correct epipolar alignment
for
correction.
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