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 correction.
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
Can everyone wear Paragon CRT?
Not everyone can wear Paragon CRT. This lens is designed for
individuals with low to moderate myopia (nearsightedness) 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). Depending on your needs,
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. At this time, hyperopia
(farsightedness) is not correctable with CRT.
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
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.
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 serious adverse events reported in the
Paragon CRT FDA clinical study.
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.
How often will I have to replace my Paragon CRT lenses?
Generally speaking the Paragon CRT lenses will have to be replaced
once a year. However, depending on factors such as protein build-up, how
well the lenses are taken care of, etc., the lenses may have to be
replaced more frequently.
What is the cost for Paragon CRT lenses?
The cost of CRT lenses are less than any surgical procedure and a
little more than the average person spends on yearly expenses related to contact
lenses or glasses.
Is Corneal Refractive Therapy 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.
Will I still need a "Visual Restriction" on my driver’s license?
We will supply you with a document that states you are participating in a
visual therapy program that eliminates the need for corrective lenses during
working hours. The document should have an expiration date 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.
I suffer from “Dry Eyes", Can I have CRT?
Probably, but we can only determine this through a thorough eye
examination. Many patients with 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.
A child’s vision changes. Is CRT appropriate for children
Yes, absolutely, CRT is used to retard the progression of
nearsightedness and other refractive errors, and leave
children and teenagers with a bright future.
Is CRT permanent?
After treatment and maximum
results are achieved, retainer lenses are worn to stabilize
the new corneal shape. Failure to wear the retainer lens on
an ongoing basis will result in the return to the
pre-existing prescription. Retainers may be prescribed
during day or night.