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Home > Archive > Lasik Eyes Surgery > December 2005 > Corneal refractive surgery is like trying to precisely sculpt JELLO
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Corneal refractive surgery is like trying to precisely sculpt JELLO
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| The Jell-O quote:
http://www.pcli.com/lasik/wavefront.html
Potential Risks of Custom Wavefront-guided LASIK
Wavefront measurements are interesting and useful, but we are not
convinced that such highly customized treatment should be used to
correct every focusing abnormality. Vision could end up worse than if
treated by standard LASIK. Our concerns are based on the following risk
factors:
Heightened expectations for 20/10 or 20/15 super vision may lead to
frustration when patients do not achieve this goal.
Wavefront-guided LASIK may reshape the cornea to compensate for
aberrations that arise from the lens. But with time, most patients will
develop normal lenticular changes and eventually have their cataracts
replaced by plastic lens implants. Now, unfortunately, their
custom-shaped cornea will no longer coordinate with the spherical
optics of their artificial lens.
Wavefront-guided treatment is much more complex than standard LASIK, so
there is more to go wrong. From our experience we have 4 areas of
concern:
Wavefront measurements are not consistently accurate. Errors may be
present that could misguide the laser treatment.
It is possible for some wavefront measurement data to be lost in the
translation to the laser treatment plan.
All computerized eye trackers we have observed have accuracy problems
the manufacturers do not seem to recognize. Critical eye centration can
be slightly off during treatment. Decentered treatment is never good,
but slightly decentered custom treatment can create complex
aberrations.
With the cornea being 70% water, highly customized treatment is like
trying to precisely sculpt Jell-O. Even when everything is done
perfectly, creating the LASIK flap and the normal effects of corneal
stretching, molding or healing may negate some of the precision of the
planned treatment.
Customized wavefront-guided LASIK may treat temporary
irregularities-which would change in time if left alone. So
considering the shoe analogy, if measurements for custom-made footwear
are taken when part of the foot is swollen, the customized shoe will no
longer fit when the foot heals.
The assumption that it is best to reduce or eliminate all abnormalities
detected by wavefront is currently in question. Studies so far have
failed to show that people with the best vision have less wavefront
abnormalities.
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| Ragnar 2005-12-17, 6:03 pm |
| The clear layers of collagen fibers that make up the cornea have a
tensile strength similar to steel. I don't think I will be snacking
on jello at your house.
The epithelium is like jello... and does have a factor in one's
refraction. It is most relevant when using rigid contact lenses.
You haven't got a clue what you are talking about.
On 17 Dec 2005 13:11:30 -0800, "Eye" <eyetooamdamaged@yahoo.com>
wrote:
>The Jell-O quote:
>
>http://www.pcli.com/lasik/wavefront.html
>
>Potential Risks of Custom Wavefront-guided LASIK
>
>Wavefront measurements are interesting and useful, but we are not
>convinced that such highly customized treatment should be used to
>correct every focusing abnormality. Vision could end up worse than if
>treated by standard LASIK. Our concerns are based on the following risk
>factors:
>Heightened expectations for 20/10 or 20/15 super vision may lead to
>frustration when patients do not achieve this goal.
>Wavefront-guided LASIK may reshape the cornea to compensate for
>aberrations that arise from the lens. But with time, most patients will
>develop normal lenticular changes and eventually have their cataracts
>replaced by plastic lens implants. Now, unfortunately, their
>custom-shaped cornea will no longer coordinate with the spherical
>optics of their artificial lens.
>Wavefront-guided treatment is much more complex than standard LASIK, so
>there is more to go wrong. From our experience we have 4 areas of
>concern:
>Wavefront measurements are not consistently accurate. Errors may be
>present that could misguide the laser treatment.
>It is possible for some wavefront measurement data to be lost in the
>translation to the laser treatment plan.
>All computerized eye trackers we have observed have accuracy problems
>the manufacturers do not seem to recognize. Critical eye centration can
>be slightly off during treatment. Decentered treatment is never good,
>but slightly decentered custom treatment can create complex
>aberrations.
>With the cornea being 70% water, highly customized treatment is like
>trying to precisely sculpt Jell-O. Even when everything is done
>perfectly, creating the LASIK flap and the normal effects of corneal
>stretching, molding or healing may negate some of the precision of the
>planned treatment.
>Customized wavefront-guided LASIK may treat temporary
>irregularities-which would change in time if left alone. So
>considering the shoe analogy, if measurements for custom-made footwear
>are taken when part of the foot is swollen, the customized shoe will no
>longer fit when the foot heals.
>The assumption that it is best to reduce or eliminate all abnormalities
>detected by wavefront is currently in question. Studies so far have
>failed to show that people with the best vision have less wavefront
>abnormalities.
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| Gee, spiderwebs are really strong for their size too - and those
microscopic collagen fibers in the eye, which may also be strong for
their size... really don't change the fact that the cornea is
deformabe, mushy and mostly water. It's especially deformable after one
has had LASIK and has cut many collagen fibers. Which don't reattach
the flap, by the way. The flap can be easily lifted by hand with a
little tiny tool many years after surgery.
Every cornea is weakened and bulging after LASIK. Charles Casebeer
testified in a deposition that ALL LASIK patients corneas are bulging.
This means you.
If you spent more time researching and less time hurling insults
perhaps you'd know something.
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| serebel 2005-12-18, 1:04 am |
| What comic book do you use to gather your ridiculous findings?
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| Wise words, eye! Look what I found
Poor Candidates
People likely to be unhappy with the results of LASIK find most of the
following sentiments to be true:
I like wearing glasses and would feel undressed without them.
I do not have problems wearing contact lenses and they give me
excellent vision for all activities.
My work or hobbies consistently require attention to fine visual
details.
I do not adapt well to change.
I get stressed out easily when things don’t seem to happen in
just the way I planned or expected.
I am a perfectionist and little irregularities bother me.
I would be very disappointed if I did not end up with perfect vision
after my surgery and would consider the experience a failure.
If I still needed some correction after surgery, and found out that I
could not wear contacts as easily as before, I would be devastated.
"Vision could end up worse than if
treated by standard LASIK."
wow!!!!!!!!!!!!! This explains why some surgeons are reccomending
regular lasik, they say your not a candidate for wavefront or that
wavefront isnt gonna make a difference over regular lasik. Well either
way it doesnt matter, all lasik induces more aberrations like you said
and proved to everyone.
"Heightened expectations for 20/10 or 20/15 super vision may lead to
frustration when patients do not achieve this goal."
Not a chance. Lasik makes your eyes worse than what you see with
contacts and possibily worse than glasses. Yes you will benefit by not
seeing the world minified behind specs but it may not be very clear
netherless. Even if you end up at 20/20 or whatever, it can not tell
your quality of vision...........
http://www.visionsurgeryrehab.org/l...es/eyechart.jpg
I think ill take my 20/30 BCVA with -5 glasses anyday over this "20/20"
Yes my glasses minify things making the 20/20 line too small but my
quality of vision is so much better!
"But with time, most patients will
develop normal lenticular changes and eventually have their cataracts
replaced by plastic lens implants. Now, unfortunately, their
custom-shaped cornea will no longer coordinate with the spherical
optics of their artificial lens."
Thats a good thing to consider. Get wavefront now and while you might
be enjoying your hopefully half decent vision, your lasik will be
wasted when cateracts develop then you still need a 2nd surgury and end
up with miscalculated IOLs on top of mismatched aberrations so you wont
be seeing very well. Why not just enjoy your crisp vision with glasses
and when cateracts come, get IOLs(medical neccessary) and enjoy your
crisp vision with reduced dependancy on glasses?
Wavefront-guided treatment is much more complex than standard LASIK, so
there is more to go wrong."
Thats why sometimes they give you regular lasik. Enjoy twice the
aberrations and no longer seeing 20/20!
"Critical eye centration can
be slightly off during treatment. Decentered treatment is never good,
but slightly decentered custom treatment can create complex
aberrations."
Thats a big concern and explains why some people have very, very bad
results from wavefront. Even a tiny amount of decenter means the laser
is removing aberrations in the wrong spots and can instead, multiply
your aberrations instead of reduce/subtract them. If wavefront goes
exactly right, its more forgiving than regular lasik but if it doesnt,
youll actually be worse off than regular lasik! Its like a gamble,
wavefront has less to lose and yet more to lose at the same time! This
is something new to me and now I understand why regular lasik is
suggested instead of wavefront for some people. You wont win with
regular lasik either and you have more to lose than just your
dependancy on glasses.
"Even when everything is done
perfectly, creating the LASIK flap and the normal effects of corneal
stretching, molding or healing may negate some of the precision of the
planned treatment."
This is a few of the 34 challenges of wavefront lasik. Making the flap
automatically gives you the nasty "gift" of more aberrations. Then the
wavefront lasik will give you more aberrations(itll remove some but
induce more) Then as you heal, more aberrations will form due to the
stretching of the cornea! Eye was right, all lasik induces aberrations,
even wavefront! You might have less induced aberrations with wavefront
vs. regular lasik but even that isnt guaranteed and the point is all
laser surgury gives more aberrations which is not a good thing, period.
"Every cornea is weakened and bulging after LASIK. Charles Casebeer
testified in a deposition that ALL LASIK patients corneas are bulging.
This means you."
Eye, whats the difference between a bulging cornea and ectasia? Are
they the same thing? Is ectasia the state where the cornea bulges too
much and must be replaced by a new one?
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| In article <1134903490.457119.201990@g47g2000cwa.googlegroups.com>,
"Ace" <acemanvx@yahoo.com> wrote:
> Lasik makes your eyes worse than what you see with
> contacts and possibily worse than glasses.
That is such total BS. I have never seen better than I do since having
LASIK 2.5 years ago--not with glasses, not with contacts.
ACE, you're only proving the rule that if crap is posted often enough
someone is bound to begin to believe it. Guess what--you're the sucker.
--
~RT
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