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1. What are the differences between CRT and Ortho-K? 2. What is Cornea Refractive Therapy (CRT)? 3. How does CRT work? 4. Can everyone wear CRT? 5. How long does it take to reach good vision with CRT? 6. How often will I have to replace my Paragon CRT lenses? 7. Is CRT a safe procedure? 8. What are the upper limits of CRT treatment? Any examples? 9. Can CRT control the progression of myopia? Answers: 1. What are the differences between CRT and Ortho-K? CRT and Ortho-K are becoming a very popular vision correction procedure in the recent years. Yet one of the most common questions that people ask is what are CRT and Ortho-K, and what are their differences. Orthokeratology, or Ortho-K, is a non-surgical process which reshapes (flattens) the cornea of the eye using contact lenses. Ortho-K is not a new method; it has been practiced by some eye doctors for 40 years. So this technology has been matured. In the past, Ortho-k produced mixed results and wasn't FDA-approved for overnight wear, so the procedure had limited appeal. Then in June 2002, the FDA granted overnight wear approval to a type of corneal reshaping called Corneal Refractive Therapy (CRT). Paragon Company owns the patent of CRT, so only one company, Paragon, can make the CRT lens. CRT technology is based on the same theory as Ortho-K, however, it has a big improvement on design and material of the lenses. That is why CRT works a lot better than Ortho-K: Ortho-K only works for people who have nearsightedness less than -4.00D, astigmatism less than 0.75D, even within the range, the result can vary a lot. But CRT can work very efficiently for nearsightedness up to

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