Therapy With Ortho k lenses
The first orthokeratology lenses (ortho k lenses) were made of a hard plastic known as poly methyl methacrylate (PMMA). PMMA was the only plastic option at the time approved for use in the eye. The problem with the plastic was that it is impermeable to oxygen, and this poses risk in terms of health of the cornea, the tissue undergoing reshaping in corneal reshaping therapy. Because of it’s lack of oxygen permeability, PMMA orthokeratology (orthoK) lenses for treatment of blurry eyesight were limited to use during waking hours, when the eye was open. Sleeping in the lenses posed too much risk for a vision shaping treatment.
Eventually, materials were developed that enabled transmission of oxygen through the lenses, which greatly increased the possibility these lenses could safely be used for corneal reshaping. The first gas permeable hard plastic lenses were developed in the 1970’s and since then have evolved to a highly gas permeable state. The FDA has approved several materials to be used for overnight orthokeratology as they have high enough oxygen transmissibility values that are rendered safe for overnight wear.
The benefits of Ortho K (Orthokeratology, OrthoK, Corneal Refractive Therapy, CRT) include obtaining freedom from blurry eyesight – perfect vision without need of glasses, contact lenses, corneal reshaping surgery like LASIK and PRK, reversibility (when OrthoK wear is discontinued, vision returns to the way it was prior to OrthoK), low expense (OrthoK therapy costs approximately half of what laser vision correction costs and myopia control – several studies have shown a positive effect in controlling the progression of blurry eyesight or worsening vision, specifically in children with nearsightedness (myopia). When considering methods of vision correction, no conversation is complete without a mention of Ortho K. It might be a particularly good option for swimmers and athletes, as contact lenses cause problems in situations where an active lifestyle is involved in many situations.
Ortho K is achieved by wearing orthokeratology lenses (ortho k lenses) which enable corneal reshaping therapy, also known as cornea refractive therapy. The tools for achieving vision shaping treatments without surgery include orthokeratology lenses including paragon crt , vision shaping treatment (VST) and many other FDA approved products. These products are particularly helpful when seeking to improve eyesight in children, and reduce change in vision , specifically myopia in children and may, in some cases reduce the risk of children with myopia advancing to high myopia.
To learn more, visit the myopia doctor directory and contact an eye myopia specialist near you.