New York Corneal Refractive Therapy
Frequently Asked Questions About Paragon CRT®
What is Paragon CRT®?
Paragon CRT is a specially designed oxygen permeable
therapeutic contact lens used in Corneal Refractive
Therapy. Corneal Refractive Therapy is a sophisticated,
non-surgical process, which reshapes the cornea while
you sleep. You remove the lenses when you awake and
are able to go throughout the day without any other
2. How new is Paragon CRT?
Contact lens corneal reshaping is not a new concept.
Previous corneal reshaping designs were only as successful
as technology allowed. Paragon Vision Sciences has taken
the recent advancements in computerized corneal mapping,
computerized manufacturing, and oxygen permeable contact
lens materials and produced a therapeutic contact lens
design that is like no other. This has allowed Paragon
CRT to become the one corneal reshaping modality that
truly stands out and the first to earn FDA approval
for nighttime Corneal Refractive Therapy.
3. Is Corneal Refractive Therapy Permanent?
No. It's temporary. If you stop wearing the lenses
regularly while you sleep, your vision will return to
its original state in as little as 72 hours.
4 .Can everyone wear Paragon CRT?
Not everyone can wear Paragon CRT. This lens is
designed for individuals with low to moderate myopia
(nearsightedness up to -6.00 diopters) with or without
astigmatism (up to -1.75 diopters). Paragon CRT therapeutic
lenses are not yet available in bifocal prescriptions
for presbyopia (which requires reading glasses or bifocals).
At your doctor's discretion you may be fitted in a monovision
mode (one eye corrected for near vision and one corrected
for distance vision). You might still need reading glasses.
However, since there are variations in patient physiology
and visual needs, the decision for CRT, at any age,
can only be made after a thorough eye exam and the recommendations
of the eye care professional. At this time, hyperopia
(farsightedness) is not correctable with CRT.
5. How long does it take to reach good vision?
Most patients have rapid improvement in the first
few days of treatment and achieve nearly their optimum
vision in 10 to 14 days.
6. What do I do to see adequately in the period of
time between when I start Corneal Refractive Therapy
with Paragon CRT and when I achieve full treatment?
It's important to understand that for a time after
you have begun treatment, but before sufficient treatment
is realized, your old glasses or contacts will no longer
be the appropriate prescription. It may involve insertion
of your Paragon CRT lenses for part of the day or some
use of temporary soft lenses in different prescriptions
as an option. Your eye care practitioner will discuss
your options for visual correction during that transitional
period of time.
Are there any risks involved with wearing Paragon CRT?
There is a small risk involved when any contact
lens is worn. It is not expected that the Paragon CRT lenses for contact lens Corneal Refractive Therapy will
provide a risk that is greater than other contact lenses.
There were no adverse events reported in the Paragon
CRT FDA clinical study.
8. Can I see with my Paragon CRT lenses in?
Yes. One of the great features of the Paragon CRT lens is that if you have to get up in the middle of
the night, you will be able to see where you are going.
Or if during the initial treatment phase you find you
need some form of vision correction, you can put in
your Paragon CRT lenses and see clearly.
9. How often will I have to replace my Paragon CRT
Generally speaking the Paragon CRT lenses will have
to be replaced once a year. However, depending on factors
such as protein buildup, how well the lenses are taken
care of, etc., the lenses may have to be replaced more
How do I care for my Paragon CRT lenses?
Your lenses should be chemically disinfected after
every use (not heat). Your eye care practitioner will
instruct you about which care system is best for you.
11. How much does Corneal Refractive Therapy with
Paragon CRT cost?
The cost for your initial fitting, professional
care, follow-up and Paragon CRT therapeutic lenses varies.
After your first year, the annual cost of CRT is about
the same as wearing contact lenses or glasses. Many
Eye Care Practitioners also offer optional payment plans,
which they will be happy to review with you. You should
consult your Paragon CRT eye care practitioner for further
12. Is Corneal Refractive Therapy painful?
The therapy is not painful. Initially, you may have
a slight awareness of the therapeutic lens. You will
not feel the lenses when you sleep and there is no sense
of physical corneal change.. just visual improvement
when the lenses are removed.
Is Corneal Refractive Therapy or Paragon CRT FDA approved?
Paragon CRT is the first therapeutic lens design
approved by the FDA for overnight contact lens Corneal
Refractive Therapy for the temporary reduction of myopia.
Paragon Vision Sciences, the manufacturer of Paragon
CRT, received the final written approval on June 13,
2002. The issuance of this approval is the culmination
of the most extensive clinical study to date to establish
the safety and efficacy of contact lens corneal reshaping
in overnight use.
What is the difference between Corneal Refractive Therapy
and Paragon CRT?
Corneal Refractive Therapy is the process of using
a therapeutic contact lens to reduce myopia by reshaping
the corneal surface while you sleep. Paragon CRT is
the product for this therapy.
15. Are there age restrictions for Corneal Refractive
Therapy with Paragon CRT?
No. The FDA placed no age restrictions on candidates
for Corneal Refractive Therapy with Paragon CRT. CRT
is being successfully performed on children 12 years
old and younger. It can be a great option for children
and teens that are active in sports activities or any
other extra curricular activities.
who are older and presbyopic (requiring reading glasses
or bifocals) may still be candidates for CRT. They may
correct their distance vision with CRT and wear near
vision glasses for close work. At the doctor's discretion
you may be fitted in a monovision mode (one eye corrected
for near vision and one corrected for distance vision).
requirements due to age or activities can only be assessed
after a thorough eye exam. Your Paragon CRT certified
eye care professional will recommend what is best for
Are the Paragon CRT lenses difficult to insert or remove?
These lenses are generally no more difficult to
insert or remove than any other similar contact lens
modality. You may want to instill comfort or rewetting
drops prior to insertion of the lenses and immediately
upon waking. The lenses must move freely prior to removal.
If you have difficulty removing the Paragon CRT lens,
there are lens removal aids available to assist this
17. If I discontinue CRT, will my vision to return
There are no recorded permanent corneal changes
post-treatment. Generally, the more myopia being reduced,
the longer it will take for the corneal curvature to
return to normal. For instance, if your pretreated correction
was - 4.50D, it would take a few days longer to return
to normal than if the pretreated correction was -1.50D.
18. My driver's license is marked that I need corrective
lenses to operate a motor vehicle. What do I do about
Your eye care professional will supply you with
a document that states you are participating in a visual
therapy program that eliminates the need for corrective
lenses while operating a motor vehicle. The document
should have an expiration date for this treatment and
you should have your driver's license updated with a
new vision screening through your local DMV office to
reflect this change, before the expiration date.
19. What happens if I lose or damage a lens?
Corneal Refractive Therapy is different than wearing
regular contact lenses. If you discontinue wear for
one night, your vision may be impaired the next day.
Previously worn glasses or contact lenses may not help.
Immediate replacement is necessary! Having a spare pair
of lenses is strongly recommended.
20. Do benefit programs cover Corneal Refractive
This is an elective procedure, and to the best of
our knowledge is not usually covered by benefit programs.
If regular contact lenses are covered under your vision
care plan, Corneal Refractive Therapy may be partially
covered. You should check with your benefits plan administrator.
21. I suffer from "dry" eyes, am I a candidate for
Corneal Refractive Therapy?
Only your eye care professional can determine if
you are a CRT candidate. Many patients with slightly
dry eyes do well with CRT. Since you are wearing the
lenses only while sleeping, the closed eye state minimizes
evaporative loss of tears and can give dry-eye patients
suitable vision without compromising the ocular surface.
22. I used to wear contact lenses, but stopped due
to discomfort. Am I a candidate for Corneal Refractive
Paragon CRT lenses are worn at night while you are
sleeping. This greatly reduces any discomfort normally
experienced while wearing contact lenses during the
23. I have astigmatism. Am I a candidate for Corneal
Paragon CRT is designed to correct myopia with to
1.75 diopters of astigmatism. Each individual should
be evaluated by a certified eye care professional to
determine if CRT is right for your visual requirements.
24. I wear glasses. Am I a candidate for Corneal
The transition from wearing only glasses to Paragon
CRT should not be a concern. About 18% of the patients
in the FDA study were non-contact lens wearers. The
dropout rate related to discomfort was only 3.9%.
25. How can I tell if I have the original Paragon
Each lens is laser marked to assure you and your
eye care practitioner that you have the original Paragon
CRT therapeutic contact lens.