What is Orthokeratology?

Orthokeratology (ortho-k) is the fitting of specially designed gas permeable contact lenses that you wear overnight. While you are asleep, the lenses gently reshape the front surface of your eye (cornea) so you can see clearly the following day after you remove the lenses when you wake up.
Ortho-k lenses are prescribed for two purposes:
1. To correct refractive errors, primarily nearsightedness, but also astigmatism and sometimes presbyopia.
2. To slow the progression of childhood myopia (nearsightedness).

How do CRT lenses work?

Paragon CRT(corneal refractive therapy) is a specially designed FDA-approved therapeutic contact lens worn while sleeping. CRT lenses reshape the cornea without permanently altering its physiology, which is especially important as the eyes of children and teens are still maturing. CRT lenses are worn at night and removed in the morning resulting in clear vision during the daytime without the use of glasses or contact lenses. Most patients have a rapid improvement in the first few days of treatment and achieve nearly their optimum vision in 7 to 14 days. The effects of CRT overnight wear is temporary, if you stop wearing your lenses your vision will return to its original state in as little as 72 hours.

Am I a candidate for CRT lenses?

This lens is designed for individuals with low to moderate myopia (nearsightedness up to -6.00 diopters) with up to -1.75 astigmatism. There are no age restrictions for Paragon CRT. 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 recommendations of the eye care professional. There is a risk involved when any contact lens is worn, however there were no serious adverse events observed in the Paragon CRT FDA clinical study.

What are the benefits of CRT lenses for Myopic(nearsighted) children?

The myopic eye is longer than the non-myopic eye. This means that instead of focusing on the back of the eye(the retina), light focuses in front of it, causing blurred vision. The onset of myopia at an early age brings with it a likelihood of life-long eye care, as well as affecting education and learning when left undetected. Studies have shown that ortho-k can slow down myopia progression by up to 40% in children thus greatly reducing the risk of ocular health problems.

How do I get fitted with with CRT lenses?

At our office we start with an initial eye exam to get your glasses prescription, corneal shape measurements, and ocular health check. Then we will proceed with a free ortho-K consult at which time Dr. Anh Le will answer all your questions and address any concerns you may have about the therapy.

Dr. Le graduated from the University of California Berkeley School of Optometry in 2003. She is the pediatric optometrist at our office and also specializes in contact lens fitting. Dr. Le is CRT certified and has 10 years of experience with the fitting of ortho-k lenses. She will make a thorough assessment to see if ortho-k will work well for you and your lifestyle. Please call us for more information or to set up your annual eye exam and ask our doctors if you qualify for CRT lenses.


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