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Ortho-K (orthokeratology) is a nonsurgical eye treatment using specially designed contact lenses to gently reshape the curvature of the eye while you sleep to improve vision. Ortho-K retainer contact lenses are made of highly oxygen permeable material allowing for safe wear while you sleep.

image of how orthokeratology flattens the cornea while you sleep

Ortho-K corneal refractive therapy lenses only affect the cornea of the eye. The cornea shape is critical in maintaining a sharp optical focus on objects by bending the light that enters the eye. The cornea is the clear part of the eye that covers the iris and the pupil. The corneal tissue is soft and can be subtly molded. The ortho-K lenses float on your eye tear film, yet provide enough pressure reshape the cornea. The iSee™ Ortho-K and CRT Lens therapy lenses gently reshape the first few microns of the cornea while you sleep.

When the contact lenses are removed in the morning, the slight change in the curvature of the corneal surface results in clear vision during waking hours.  This reduces the need of daytime contact lenses or glasses. With Ortho-K corneal refractive therapy contact lenses, 20/20 vision can be restored in as little as one day to a few weeks.


The best part is that Ortho-K cornea refractive therapy is safe, non-surgical, non-invasive and reversible. Results may vary so ask your eye doctor if Ortho-K lenses areright for you or your child.

How Paragon CRT Lenses Work

How To Wear OrthoK

What is Myopia

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