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Ortho-keratology, or corneal refractive therapy (CRT) is a safe alternative to the standard vision correction. It utilizes a non-surgical mechanism to reshape the front surface of your eye while you are sleeping, thus resulting in clear vision during the day.  Corneal reshaping is reversible; therefore the lenses have to be worn during sleep every night.

How does it work?

Nearsightedness occurs when eye length increases in size, causing the light entering the eye to focus at a point before the retina instead of on the retina. This causes distance objects to appear blurry and out of focus.

CRT lenses gently flatten the front surface of the cornea to help the light entering the eye focus on the retina. When special rigid contacts lenses are worn over night, the cornea is remolded which allows you to see clearly all day without wearing contact lenses or glasses.

Is it right for you?

  • CRT is ideal for active children, especially ones involved in sports, as well as children who are genetically predisposed to progressive nearsightedness.
  • CRT is suitable for adults whose careers and pastimes are not conducive to wearing contact lenses or glasses.
  • CRT is a healthy alternative for people who experience increased dryness or discomfort with soft contact lenses wear. Also, for adolescents who are not eligible for LASIK.

Are they safe?

The Food & Drug Administration (FDA) has approved CRT lenses to be worn safely overnight. The FDA approved CRT lenses for all ages. CRT lenses have been proven as a safe alternative treatment for nearsightedness.


  • Myopia affects a quarter of the world’s population. By 2020 it is estimated that 2.5 billion people will have myopia or nearsightedness.
  • Studies suggest that corneal reshaping may slow down or stop the progression of nearsightedness.
  • In a study done by the FDA, 65% of patients were able to achieve 20/20 vision after wearing Paragon CRT lenses.