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MYOPIA
REDUCTION...
A
VIEW FROM THE INSIDE
by
Steve
Gallop, O.D.
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Myopia
reduction is a topic that should be difficult to ignore for those
involved in delivering full-scope optometric care. The prevalence of
myopia in the general population is staggering1 and it is
probably true that most will readily accept the standard opinions on
their condition and its treatment options. There is, though, a
considerable population desiring more personal control in their own
health processes. I include myself in this category. Even before my
life's path led me into optometry, I began to question the prevailing
wisdom offered in my optometric/ophthalmologic care. At one point,
with a prescription of over 10 diopters of myopia with astigmatism, I
attempted a daring, if not seemingly insane, feat. Riding my bicycle
without compensatory lenses, I experienced a surprising level of
performance that changed the way I viewed myself and my condition.
This led me to seriously question the care I had received over the
years as well as the nature of what is called myopia. |
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To the best of my recollection, I was born with the complete
absence of refractive headgear. While perusing my genetic endowment
however, it quickly became evident that I was the product of a union
between your garden-variety myope and your standard emmetrope. Could
it be that myopic genes are just dominant? So dominant, in fact, that
in my heyday I was more than twice the myope my mother was? In fact,
my mother says that she had the best eyesight until age twelve. She
was then fitted with low-power minus lenses which continually got
stronger. At this point, I am defining myopia as the need to wear
compensatory lenses for standard distance acuity. This is more
appropriately called nearsightedness. My sense is that it isn't so
much the nearsightedness as it is a propensity for myopia that may be
truly inherited. Certain avenues of adaptation become more easily
followed. I hope to make a distinction between myopia and
nearsightedness in what follows. Briefly, nearsightedness is the
refractive condition which is typically compensated with concave
lenses while myopia is more about the tendency to shrink visual and
perceptual space and to restrict the musculature (and often the
emotions) while attempting to solve the problem of responding to
visual stress. I will not attempt to consider concurrent conditions
such as binocular or accommodative status, visual-motor integration,
etc. to any great degree though they are certainly important. |
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The avenue toward nearsightedness was readily available to me
through genetics and was probably compounded by certain personality
traits (and visual behaviors) that are commonly found with myopia.
Then, at the age of eight, when the stresses of academia proved
unnerving, I was taken into a dark room and forcibly administered
certain drugs which would (theoretically) paralyze my accommodative
mechanism. This would presumably render me unable to provide false
information to the examiner- a kind of sodium-pentathol for the
accommodatively deranged. As I look back - now that I have
reached the pinnacle of the mountain of nearsightedness and have begun
my descent down the other side - I feel certain that this initial
refractive experience, at the hands of an ophthalmologist, was quite
ordinary. By this I mean that I was probably seen as a typical case of
early-onset, genetically programmed myopia (I'm not certain just when
the astigmatism surfaced). By this I also mean that there is a strong
likelihood that I was overcompensated, probably by no small amount.
Whether overdone or not, the introduction of minus lenses is a
procedure taken much too lightly in standard clinical practice. The
effects of such treatment are not restricted to changes in acuity.
There are frequently ignored patterns of addiction to such
prescriptions, not to mention subtle, slowly increasing changes in
perception and behavior.2 |
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Once a visual system is influenced by interaction with a
concave lens a predictable process is likely to follow. This is no
less true of a system that is not actually as it appears to be at
first glance. When viewed in a state of accommodative spasm, the
system appears to be in need of compensatory lenses, when in fact it
requires something very different. In any case, once the lens is
applied, what is often a transient condition becomes a lifelong
situation, one likely to deteriorate with time. There are many mildly
nearsighted people walking around quite happy (a little blurry
perhaps, but happy), who have never even had an eye exam. To them,
things just are the way they are, and they would probably be surprised
to find that it's not that way for everyone. Ametropes are considered
to have something of a progressive disease. While compensating lenses
seem to alleviate the problem, has there ever been a good control
study to determine if the condition progresses in the same manner if
such treatment is avoided? Here it must be noted that 20/20 acuity
(the end-all of most lens prescribing) is merely normal. It is not
perfect nor is it generally even necessary in our mostly near-centered
day-to-day world. With the intervention of a concave lens, especially
in the case of a child, the system gets the message that the adaptive
process it has chosen is beneficial. Due to the impact of the combined
authority of the doctor, parents and teachers, the need for the
glasses becomes absolutely real. The child accepts the glasses with
the impression that without them failure and danger are immanent. |
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Another danger of the influence of minus lenses has to do with
what I call the "sponge aspect" of the progression of
nearsightedness. When a sponge is completely dried out it will not
pick up much water but, once it starts to get wet it will absorb much
more quickly until it reaches its capacity. The visual system is quite
similar, as is the human child. This seems especially true of the “myoping”3
child. The preferred avenue of adaptation has been acknowledged as
acceptable and has been encouraged by the lens application. This
creates the conditions for continuation of the process. The sponge is
just starting to get wet. |
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There are several complicating factors I would like to address.
One is a psychological dilemma. The child in school is slowly but
surely shown that seeing at great distances isn't very important to
getting along in school. Since so much time is spent and, so much
importance is placed on school performance, the subconscious begins to
problem-solve. Since one is being asked to perform so much at near
and, since this is so important, it would seem a good idea to tune
oneself into this small-distance attitude; this is the process of ”myoping”.
This a good approach as far as social acceptance and academic
achievement but, it is a poor response to the visual environment. It
sets the stage for perpetual mismatches between internal and external
perception, cognition and learning. The majority of our time is spent
indoors and, in the school setting, working with distances well within
so-called optical infinity. It obviously doesn't matter if we can see
across the football field as long as we can focus on the desk and
occasionally make that great leap out to the blackboard. But sometimes
that leap to the board doesn't happen as fast as it used to or, maybe
doesn't happen at all. Then there is great concern because you can't
see far away. Then what happens? An eye exam is performed that
evaluates nothing but distance acuity! The child is then overcorrected
into sensory paralysis and told that these glasses will be a permanent
fixture like arms and legs. Then the sponge starts absorbing. |
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Just as an aside, this brings us to Skeffington's tremendous
insight into the adverse affects of "socially compulsive,
visually near-centered tasks of the culture".4 What
truly seems biologically unacceptable is the fact that these tasks are
two-dimensional and,
perhaps more importantly, do not include adequate motor involvement.
Primal/natural peoples did considerable near work but, all their
activities were in three-dimensional space and had considerable motor
involvement (not to mention the different psychological/emotional and
social context within which work was being done; perhaps this speaks
to Skeffington's use of the terms “socially compulsive” and “of
the culture” in order to precisely define the "near centered
tasks" which are most problematic). It has been well documented
that there is a correlation between increased academic achievement and
increased myopic progression.5-9 It has also been well
documented that societies that were not tied to the written word
showed considerably less nearsightedness.10,11 Another
problem is the fact that modern near work is done within small
surroundings 12,13,14; there is usually no opportunity to
"stretch" the visual system periodically. There is no chance
to gaze easily off in the distance due to (culturally imposed) job
pressures and time constraints and/or, lack of sufficient visual
space. While this cramped visual space environment places continuous
demands on the binocular/accommodative mechanisms, it also
continuously reduces the availability of and, in some respects the
need for, peripheral awareness which tends to diminish due to
inactivity. |
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When considering the whole person, or even the whole visual
system, spectacle lenses can create their own problems. One must look
directly through the optical centers of spectacle lenses to get the
truest optics and least distortion. This is especially true of higher
power lenses but, as it is said - “The journey of a thousand miles
begins with a single step.” Because of the optical mechanics of
spectacle lenses, when viewing off-center, there will be increased
chromatic, spatial and, prismatic disturbances. In higher
prescriptions the prismatic effects can induce diplopia and hence the
need to learn to suppress. Because of this, one will also develop the
tendency to move the head, neck and upper body instead of using eye
movements only. This is a giant leap backwards in the process of
visual development where it is hoped that one learns to move the eyes
independently of the rest of the body.15 |
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Another aspect of compensatory prescriptions is astigmatism
which appears to be present, to some degree in most people. This is
easily measured objectively, especially with autorefractors. It also
seems that often a monocular measurement will reveal significant
astigmatism which seems to lose its subjective importance when both
eyes are used simultaneously. I believe it is important to be stingy
with astigmatic compensations because they tend to be very
restricting. These prescriptions are optically highly structured and
rigid and, may cause added rigidity in the individual. In the presence
of typical nearsightedness, the individual upon awakening each day,
must agree to deny some part of herself. Without refractive
appliances, the world appears very blurred to me. As a result of the
culturally imposed necessities of everyday life, it is made very
difficult to function in this manner. I must use artificial lenses in
order to play along and see “clearly “ that I might fit in
properly. With compensations for simple nearsightedness, besides this
“to thine own self be untrue” aspect, there is a shrinking
of visual space which is all but unavoidable due to the physical
limitations of the frame and the changes in light distribution caused
by concave lenses. While this is basically undesirable, at least it
occurs in a fairly uniform manner. In the case of astigmatism, there
is even more of a unique natural visual experience which, when
compensated, shrinks in an unbalanced manner. |
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The next issue is that of over-compensation. Here I am merely
trying to look at a fairly mechanical understanding of the situation.
I am not yet going into the idea that concave lenses contract and
constrict available stimuli, leading to a diminution of safe and
useable visual, emotional and psychological space. A nearsighted
individual has an overabundance of refractive power (or “plus”) in
the optical system. This would seem to explain the use of opposite
lens power (or “minus”) to compensate. With over-compensation
doesn't this simulate farsightedness and a constant need to over
accommodate? This would seem to be very confusing for someone working
so hard to create a workable adaptive mechanism. While this approach
might work as a therapeutic strategy, it is disastrous as a
compensatory approach. |
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Another problem with an over-compensating lens is that it
functions to eliminate sensitivity.
It has been my experience that the typical compensatory
prescription is stronger than necessary. This tends to overpower and
fatigue the visual system in various ways. The wearer is unable to be
aware of normal fluctuations in visual function, especially the most
easily detected which is focus. Vision is not a static entity. There
are fluctuations all throughout the process. Compensating lenses not
only shrink the appearance of the external, but shrink the levels of
flexibility and sensitivity internally.
The resultant dulling of sensitivity is one of the catalysts
leading to mismatches in perceiving both the external and internal
environments. This was undoubtedly a factor in my case. |
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Having been assured early on that I would need to wear glasses
for all activities other than sleeping I soon became one with my new
appendages. One teenage morning, for some unknown reason, I decided to
perform my first function of the day before slipping into my lenses.
The door to my room was not in its usual position and I met it
head-on. I can remember, at that moment, after experiencing an array
of entoptic phenomena, thinking that there must be more to this vision
thing than just glasses. A mere fifteen years later this became even
more evident and I started on my way to become my own optometrist.
Sometimes I tend to do things in an extreme manner. A good example of
this is my previously mentioned first experiment with the myopic
condition. |
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To preface this story, I must say that at that time it was my
sincere impression that my nearsightedness was out of control. My
prescription was made perpetually stronger and no alternatives had
been presented (until I came across the works of Bates 16
and Huxley 17 ). I was absolutely convinced that I would
either end up blind or would need to hire someone to hold my head up
under the weight of these ever-expanding lenses. There was no doubt in
my mind that I needed to have these glasses on to do everything.
Certainly, there had never been any advice to the contrary up to this
point and the door in the forehead reinforced this. |
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So, one day I decided to try something. I mounted my bicycle,
glasses clutched tightly in hand, and proceeded to ride through
Philadelphia rush-hour traffic. I was shocked to find that I could
navigate quite well without harming myself or others. No flat tires,
no collisions, no glasses! This did not fit in at all with any of my
perceptions of my situation. Something was very wrong out there (or
was it in here?). At this time I was only months away from beginning
optometry school. Needless to say, I had a somewhat different agenda
than most of my classmates. |
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This experience led me to question many things. First it caused
me to rethink my lifelong situation. I had always felt helpless and
dependent on my glasses. Now it was obvious that I had much more
ability, more power to control my own destiny, than I had thought.
This was the first step to a new attitude. Other questions came up
concerning myopia itself; What is it? Where is it? Why is it? |
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What is it? |
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Is myopia a condition that deals with focusing concrete,
discreet images that exist outside the individual? Are there other
things to see out/in there? |
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Myopia
is typically defined as the inability to produce clear retinal images
from distant objects - what I have been calling nearsightedness. This
may be caused by a variety of ocular, optical or functional
difficulties manifested while visually interacting with the external
environment. However, there is probably an equal distance to be
traveled going within as going outside ourselves. While it is true on
the surface that myopes (since they are usually nearsighted) cannot
clearly define distant external objects, concern should also be
directed at the ability to see within clearly. While it is often felt
that myopes tend to be withdrawn, introverted individuals, this does
not address the true nature of the condition. Myopes may tend to
inwardize feelings but, this inwardization will probably be found to
be just as "blurry" as the distance acuity. There is often a
tendency to emphasize and depend on external cues as a basis for
decision making rather than trusting the inner voice. This causes a
continually expanding gap between inner perception and external
reality and, damages self esteem.18 One reason for this can
be seen in the previously mentioned statement that when a myope
awakens she must put on her glasses to become an acceptable member of
society. This says that it is not okay to truly be yourself and join
in with the others. While it is important to have reasonable acuity
for activities such as driving where safety is crucial, the child
typically receives an official pronouncement, which leads to an
internal program, that this clear sight is a must. This however is not
the true reality for the myope in her natural state. Things do look
blurry without compensatory lenses. A person needs time to deal with
this internally and come to an understanding of how things are before
just accepting external judgments on her condition. With the
unconditional acceptance of prescribed lenses, unaccompanied as they
usually are by any discussion of the nature of the condition or
treatment options, the myope must constantly ignore her true nature
and just go along with the program. There is little identification
with who she really is and how she really SEES things. All she knows
for sure is that this is bad, at least according to the
"authorities". |
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Where is it? |
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Is myopia in the eyes? Is it in the mind? Is it in the body? |
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If
it is in the eyes how can different practitioners come up with
different prescriptions? Perhaps much myopia is actually in the doctor
or in the phoropter (there sure seems to be quite a bit in the
autorefractor). Why cannot this incredible brain recalibrate a certain
amount of blur into a clear, meaningful image? Actually, a study was
done where "[t]hey recorded from cells in the frontal cortex of
the brain while stimulating the retina, and showed that the patterns
in which stimuli are received, even on the retina itself, can be
reprogrammed from moment to moment, and this ability can be
demonstrated physiologically...[T]he motor -output system of the brain
(efference) has an effect on the input (afference): the brain 'selects
its input'."19 This has been demonstrated on both the
psychological and physiological levels. |
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It is not hard to accept that the body may induce some myopia.
Sitting in a classroom with no ergonomic design, the child must often
malalign her body to achieve the best position for dealing with
classroom activities.20 This disturbs the relationship
between the visual apparatus and the rest of the body. The visual
physiology must now adapt to come back into balance with the rest of
the body in order to best achieve a self-consistent system. This
system may now be aligned within itself but, it is now out of
alignment with its environment and with its original understanding of
its own balanced state. Once the myopia begins, it becomes a powerful
influence unto itself. It causes contractions of the body, of the
mind, and of the spirit. Physiologically, the problems stemming from
spectacle lenses have been previously discussed. The
"freezing" of the refractive status and of the eyes in the
head can easily permeate the organism, causing rigidity and
suppression in the realms of feeling, thought and behavior. If these
issues are not addressed early on, the condition goes quickly out of
control, or more accurately goes into over-control. This leads
directly into stasis and various levels of paralysis, psychologically
and/or physically. |
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Why is it? |
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Does myopia stem from the requirements of near performance? |
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Is it related to fear and the need to hide from the unknown? |
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There
are certainly different causes of different peoples' myopia. Some are
fairly concrete, others may not be strictly optometric. Each
individual is likely to be affected by some combination of these.
There is usually some degree of fear associated with the condition.
There is fear of the unknown, fear of blur which is associated with
fear of not being in control. This issue can usually be dealt with,
initially, by allowing people to think differently about their
situation by giving them some empowerment. This can be done by
something along the lines of my own bicycle story. |
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Part of the overall problem lies in our culture which is highly
myopic. Our culture is more than willing to shut out awareness of the
whole in favor of zeroing in on tiny details. We are forever squinting
through pinholes at a world that begs to be viewed through a wide
angle lens. |
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It is known that 20% of retinal fibers, representing
approximately 80% of the area of the retina, do not go to so-called
higher visual centers.21 This says that most incoming
energy is interacting with this portion of the neurophysiology and not
with the tiny foveae. These fibers go to areas such as the superior
colliculus where they transmit information about balance, orientation
and space volume. |
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This ties in with two of Skeffington's22 four
circles: anti-gravity and localization. These concepts represent the
organism's coming to terms with the physical world and understanding
its relationship within the visual environment. To this add the fact
that peripheral vision develops in advance of central vision in the
organism. All this implies that vision is a primarily peripheral
process with central vision added in as a bonus to grasp desirable
objects/moments that we find enjoyable. |
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It appears more likely that vision is really about balance,
movement, relationships, interaction and awareness. All of this may be
included in a broad category of
CONTEXT. Context is what gives true meaning to the particulars within
the whole. These concepts are, in general, more fully experienced and
utilized within the subconscious, at least initially, until we need or
want to bring them into conscious awareness. They usually just work
automatically to whatever degree they may be developed. Balance,
movement, understanding relationships, quality of interaction and
awareness are all developed and are all malleable. But, they are also
deeply rooted, emotionally charged, and therefore sensitive when it
comes to change. |
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This begins to paint a more accurate picture of what we are
dealing with in understanding the true situation for someone involved
in the process of “myoping”. There is so much more at work and at
stake for such an individual. "Myopic individuals are dependent
upon 'corrective lenses'. Myopic children may experience social and
psychological problems due to negative peer influence as will as
limitations in participating in contact [team] sports. Due to
exclusion from these sports, myopes may become loners”.2 Myopia
is also a concern due to the high incidence of ocular pathology...It
has been estimated that myopia is the sixth leading cause of
blindness".23 Therefore, the process of prevention or
enhancement is no simple matter. |
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Now we get to the so-called reduction of the so-called myopia.
Initially, it was unclear to me just what myopia reduction meant. It
now appears to be a combination of many factors including changes in
prescription, attitude, awareness and processing. It is important to
address issues of fear and control when considering change for myopes
(and most of us for that matter). The first sign of blur often
triggers something of a panic attack unless it is accompanied by an
acceptable explanation and a sound plan. Much time has been spent
building this nice, tight system and any attempt to loosen it up will
not be taken lightly. I have found it useful with myself and my
patients, to reduce the prescription gradually in cases of higher
prescriptions and/or to modify wearing schedules with weaker
prescriptions. |
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The initial change is aimed at effortless near and mid-range
acuity since this is where most of the action takes place in our daily
lives. This also gets the prescription into a range where sensitivity
is restored to the system. By changing from an overpowering
prescription to one that allows an individual to experience her visual
system and herself more easily, she is now able to become more aware
of what she is doing while being visual. This method of lens
application differs greatly from most studies on the use of plus
lenses to prevent myopia.24 These studies typically hand
out a randomly selected plus lens to the experimental group. Such a
procedure is like trying to put size-7 shoes on every adult; this
would quickly lead to the assertion that shoes are inappropriate for
all adult human beings. The careful modification of the present
prescription creates an opportunity to function more appropriately and
efficiently, which in turn often leads to a reduction in stress and an
increase in self-trust. Part of this increase in self-trust is due to
the nature of many vision training (VT) activities. Many procedures
require individuals to trust themselves and their perceptions. There
are unique opportunities to rely on internal information rather than
external influences in the decision making process. A good example of
this comes with procedures that involve "SILO" where feeling
tone is so important as is immediate perception and, where logic and
prior conditioning tend to interfere with true perception. The
importance of increased self-trust, especially within the context of
the visual process, should not be surprising given the dominance of
vision as a means of interacting with our world. Another important
factor in reducing the prescription in this fashion is its tendency to
allow accommodation to be less strained during most daily activities,
for which standard prescriptions are not designed. |
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There is much discussion about blur acceptance because once the
fear dissipates and a little blur can be tolerated the benefits of
this change become possible. A prescription aimed solely at sharp
distance acuity demands that a price be paid in terms of stress and
muscular tension. This often leads to a reduced tendency to be
flexible in thinking, feeling and problem solving. Usually, once a
person feels safe about the process, and realizes the possibilities,
the blur will cease to be as important an issue and will diminish.
Once the individual is given freedom from excessive acuity dependence
and has some understanding of her internal and external visual world
the original level of acuity can be restored. This will almost
certainly be achieved with a reduced prescription from that originally
worn. The real change, however, has taken place in behavior. The
prescription can now be a tool, used at the discretion of the wearer,
instead of a crutch. Again, as with my bicycle episode, once I was
made aware of my true abilities I became able to control the use of my
lenses instead of the other way around. |
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It should also be noted that improved peripheral awareness is
critical as it creates a stronger foundation on which to build all
other areas of visual information processing - including acuity.
Improved unaided acuity is practically guaranteed by good, solid
peripheral visual function.18 (p. 18)
This ties in with the importance of context. As the whole
becomes better understood and, therefore more useable, the parts
become more meaningful and more easily grasped. |
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One comment I have received in every case (including my own) is
that after wearing a reduced prescription for even a short time, any
attempt at wearing the old one results in discomfort. Initially, each
person reports that while things might be a little clearer with the
old prescription, this is accompanied by tension around the eyes and
head. This response to the old prescription persists. My response is
that this was how they were feeling on a constant basis before,
without even knowing it. This is another result of the sensitivity
issue previously mentioned. A side note: my preference has been to
prescribe contact lenses for near along with low minus spectacles for
distance needs. There is a relatively small percentage of the normal
day that truly requires a full distance prescription be worn. When we
are not viewing at “optical infinity” such a prescription is
inappropriate. Wearing a prescription that is more in line with the
majority of one’s visual demands throughout the day provides greater
opportunity to stay in that zone of sensitivity and reduces visual
tension. This was the first method I used to reduce my own
prescription. Initially, I reduced my contact lenses by 1 diopter and
kept a pair of -1.00 spheres in my car for those special occasions
when extra acuity would be helpful. Those occasions were rare at
first, then became nonexistent. I found this to be an excellent
starting point, opening the door for a good, solid VT program to help
me truly begin to understand vision for myself. |
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Better efficiency is not created. If it existed at some point,
which in most cases it did, it can only be coaxed back to the surface.
This must be done gently and slowly with an attitude of “not-doing”,
that is, without forcing the issue and without attachment to the
outcome. In my case, when I finally let-go of the perceived need to
reduce my prescription, and decided just to work on vision - the
emergent, I was able to restore balance to my visual system and the
prescription reduced. My feeling is that, in most cases, a state of
balance once existed and was lost owing to some event(s) or
circumstances which created the need to SEE differently. Under such
circumstances, context is lost in favor of inappropriate attachment to
some part of the whole. Unfortunately, once this stimulus was removed,
the individual forgot or was unable to return to balance. 25
Often, the stimulus is unrelenting, as in the case of academic
demands, and the perceived need to maintain the adaptation remains.
This adaptation is a filter through which everything must now pass.
While it may have been a useful response to the situation, it is now a
hindrance to optimal function over the long haul. |
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One of the reasons that myopia reduction has such a bad
reputation outside behavioral optometry is measurement. It is easy to
measure refractive error, axial length and corneal curvature. It is
not so easy to measure comfort, awareness, thinking or behavior. Many
people seem to change little in their refractions after a program of
myopia reduction. However, with these same people, better acuity is
achieved with less compensation. It seems that once the physiology has
changed it is difficult to change it back. It also seems that this is
unnecessary. We live in a subjective world; therefore it is the
subjective changes which I feel are most important and most gratifying
to achieve. |
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When visual information processing is enhanced and
self-acceptance and awareness are rebuilt, the system works more
smoothly. In clinical practice, I have observed close to 90% of my
“myoping” VT patients to have improved unaided visual
acuities whether they began with 20/20 or 20/400, no matter what
reason they chose to begin VT. True myopia reduction comprises
reduction of the significant signs and symptoms of the myopic
condition. These include constricted awareness and perception,
inefficient information processing and problem solving, inappropriate
relationships to self and environment and, the like. Through the
visual system, we have the ability to guide people, enabling them to
observe some of these behaviors and make informed decisions as to
possible changes available. According to neuroscientist Eric Kandel,
"The very fine structure of our brains and the degree of
sensitivity in delicate interconnections between the nerves are not
fixed...but can actually be changed by learning. This means that when
new contexts come along, the structure of our brains can respond to
them. Meaning can actually modify the structure of the human brain”.26
Perhaps there is some recalibration of the neurophysiology which
enables a once blurry retinal image to be interpreted as clear.
Perhaps the improvements in efficiency of visual information
processing that result from vision training make everything work more
smoothly. Whatever the mechanisms, the refractive, visual and, overall
functional and behavioral changes available through vision enhancement
training are of great benefit to those who seek them. |
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References |
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1.
Sperduto RD, Seigel D, Roberts J, Rowland M. Prevalence of myopia
in the United States, Arch Ophthalmol, 1983; 101: 405-407 |
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2.
Sherman A. Myopia can often be prevented, controlled or
eliminated. JBO, 1993, vol.
4, num 1:16-23. |
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3.
Thanks to Dr. Donald Getz for the term "myoping" |
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4.
Skeffington AM. Practical Applied Optometry. OEPF . Santa Ana,
CA. 1950. |
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5.
Hynes EA. Refractive changes in normal young men. Arch Ophthal,
1956,56:761- 767 |
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6.
Hayden R. Development and prevention of myopia at the U.S. Naval
Academy. Arch
Ophthal, 1941, 25(4): 539-547 |
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