Download CONDUCTIVE KERATOPLASTY(CK)

Normal Eye
Focusing Lens
Retina
Focal Length
CLEAR
Focused
Image
Cornea
CK is designed for people ages 40 and over
who use glasses or contacts for hyperopia or
presbyopia, but who have otherwise healthy eyes
and stable vision.
With today’s technology, most refractive vision
problems can be corrected. You and the doctor
will discuss which procedure (or combination of
procedures) is right for you and your specific
needs. Pre-surgery testing and discussions with the
doctor will help determine if you should consider
CK, monovision or other refractive techniques.
Hyperopia or Farsightedness
Objects close up and in the distance tend to be
blurred. Hyperopia occurs when the eyeball is too
short or the cornea is too flat, causing light to focus
behind the retina rather than on the retina.
Presbyopia
Farsighted Eye
Focal Length
BLURRED
Image
Through the natural aging process, the lens of
the eye loses its effective ability to change shape
and accommodate focus changes from distant
objects to near objects. Good near or reading vision
is lost. People with presbyopia usually
wear bifocals, magnifying reading glasses, or use
monovision (which corrects one eye for close
vision and the other for distance vision) with
contact lenses. Adults over age 40 are most likely
to develop presbyopia.
© 2003, ApaGrafix, Inc., CON003-30203-752 • 1-800-521-5361 • 770-591-4474 • www.apagrafix.com • email: [email protected] • All rights reserved.
Are you a candidate?
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CONDUCTIVE KERATOPLASTY (CK)
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For Mild to Moderate Hyperopia and Presbyopia
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Reduce or eliminate the need for glasses,
contact lenses or bifocals without
invasive surgery
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Both eyes are usually corrected for people with
hyperopia; however, a technique called ‘blended
vision’ is usually used for people with presbyopia.
Blended vision corrects farsightedness in only one
eye, leaving the other eye unadjusted. The patient
can then use one eye for reading and the other for
driving and viewing objects in the distance.
F
or the first time, doctors can treat farsightedness (hyperopia) and presbyopia without
a laser or scalpel. A new, noninvasive
technique called Conductive Keratoplasty
(CK) can correct patients’ vision quickly, safely
and effectively. Unlike LASIK, PRK and other
refractive vision correction techniques which cut
and remove tissue, CK uses radiofrequency energy
to gently reshape the eye.
Advantages of CK
• Noninvasive
Before Conductive Keratoplasty
• No cutting or removal of tissue
After CK
• Little pain or discomfort
• Quick recovery
• Most patients no longer need glasses or
contact lenses following the procedure
• Can be used for patients with dry eyes
Refractive Errors
In normal vision, images both close up and in
the distance are clear. Light enters the eye through
the cornea and is focused at a single point on the
retina in the back of the eye. Refractive errors such
as nearsightedness, farsightedness, astigmatism
and presbyopia occur when light misses the retina,
causing the eye to lose its ability to focus clearly.
The Procedure
The entire CK procedure takes less than three
minutes per eye to complete, and can be done right
in the doctor’s office. First, the doctor numbs the
eye with local anesthetic drops. Once the eye is
numb, a special holder is placed between the
eyelids to keep the eye open. The doctor marks the
cornea with tiny dots of rinse-away dye. Then, a
thin pen-shaped instrument is used to apply dots
of energy in a circle around the edge of the cornea.
The CK procedure itself is painless, although
some patients experience a scratchiness or
‘foreign-object’ feeling in their eyes for a day
or two that can be relieved with over-the-counter
pain medications.
After Conductive Keratoplasty
Conductive Keratoplasty
During a quick in-office procedure, CK uses a probe as thin as a
human hair to apply controlled dots of radiofrequency energy (8–32
points depending on the correction required) in a circle around the
edge of the cornea. Where the points of energy are placed, small
areas of corneal tissue shrink. The combined effect of all applications
produces a constricting ring around the cornea, which pulls like a belt
to steepen its curvature. The new sharper curve to the cornea bends
light rays a little more than before CK to bring objects into focus
directly on the retina, improving the patient’s vision.
The only medication required during the short
healing period is eye drops. Most people can
resume their normal activities, including working
and driving, within 24
hours after CK. The
doctor will probably
recommend that you
avoid rubbing your eyes
or getting unclean water
(i.e. from a lake or
swimming pool) in them
for at least two weeks.
Usually, vision will begin to improve
immediately after CK and will continue to improve
for several weeks. During that period, your
eyesight may fluctuate. Because CK treats the area
outside the optical zone (the area you see through)
and does not cut or remove tissue, it is considered
a very safe vision correction procedure. A few
patients may experience non-sight-threatening side
effects like light sensitivity, a slight ‘foreign body’
sensation or astigmatism. These side effects are
usually temporary and diminish over time. With
some patients, the effect of the procedure may
moderate and they may desire re-treatment.