The History of Orthokeratology (Ortho-K): Origins to Today
Orthokeratology (Ortho-K) is a non-surgical, reversible method of vision correction first developed in the 1960s. It uses specially designed gas-permeable contact lenses, worn overnight, to gently and temporarily reshape the cornea — giving clear daytime vision without glasses. What began with rudimentary glass lenses has since evolved into one of today's leading approaches to myopia control. Its history is as fascinating as the science behind it: a story of innovation, setbacks, and steady refinement.
Key Takeaways:
- Ortho-K is a non-surgical, reversible vision-correction method using specially designed contact lenses.
- It has evolved significantly from its early days, driven by advances in lens materials, design, and corneal imaging.
- Ortho-K is now widely used to help slow the progression of myopia, particularly in children.
Table of Contents:
- Early Days of Orthokeratology
- Development and Advancements (1970s–1980s)
- Milestones: FDA Overnight Approval & Digital Lens Design
- A Turning Point: Ortho-K and Myopia Control
- The Role of Technology in Ortho-K's Evolution
- Ortho-K Around the World
- Modern Ortho-K and What Comes Next
Early Days of Orthokeratology
The roots of Ortho-K are embedded in the early developments of contact lens technology in the 20th century. The first observations that laid the groundwork were made when optometrists noticed that glass contact lenses — the norm at the time — had the unintended effect of altering the shape of the cornea. These observations were intriguing, but were not initially pursued for therapeutic purposes.
It wasn't until the 1960s that the idea of intentionally reshaping the cornea to correct vision began to take formal shape. This pivotal moment is marked by the contributions of George Jessen, an innovative optometrist who introduced a concept he called "Orthofocus" — a primitive precursor to modern Ortho-K. Jessen proposed that specially designed contact lenses could reshape the cornea to correct refractive errors such as myopia (nearsightedness), a significant departure from simply using lenses as an alternative to spectacles.
The early lens designs and materials were rudimentary by today's standards. Made of glass, they were effective at altering the cornea's shape but uncomfortable to wear, especially over extended periods — a major barrier to wider adoption. They also required prolonged wear to achieve the desired effect, which carried risks such as reduced oxygen transmission to the cornea.
Despite these challenges, Jessen's work laid the foundation for what would become a significant field in optometry. Over the following decades, advances in materials science — particularly gas-permeable lens materials — together with a deeper understanding of corneal physiology, led to substantial improvements in comfort, effectiveness, and safety.
In these early stages, lenses were primarily made from polymethyl methacrylate (PMMA), a rigid plastic that was one of the first materials used for contact lenses. While effective at reshaping the cornea, PMMA had a significant drawback: it was impermeable to oxygen.
The cornea, unlike most tissues in the body, has no blood supply of its own and relies on oxygen diffusion from the air and the tear film. PMMA lenses acted as a barrier to that oxygen — and when worn for extended periods, as early Ortho-K required, they could deprive the cornea of the oxygen it needed. This could lead to corneal hypoxia and complications such as corneal oedema (swelling), with symptoms including blurred vision, halos around lights, and discomfort. In some cases it also increased the risk of corneal neovascularisation, where new blood vessels grow into the cornea.
These limitations capped how long lenses could safely be worn and highlighted the need for better materials — setting the stage for the move to gas-permeable lenses in the years that followed.
Development and Advancements (1970s–1980s)
The 1970s and 1980s were pivotal decades for Ortho-K. The most transformative development was the introduction of rigid gas-permeable (RGP) lens materials, which directly addressed the oxygen-permeability problem of PMMA.
RGP lenses are made from silicone acrylate or fluorosilicone acrylate — materials that allow far more oxygen to reach the cornea than PMMA. This greatly reduced the risk of corneal hypoxia and related complications, so lenses could be worn comfortably for longer periods, making them far better suited to the overnight wear that Ortho-K typically requires.
Another key figure during this era was Dr. Richard Wlodyga, who, with other pioneers, developed the first reverse-geometry lens design. This featured a central zone flatter than the peripheral cornea, surrounded by a steeper secondary curve, allowing for more controlled and effective corneal reshaping. The result was better comfort and a shorter time to achieve the desired effect.
This period also saw a growing understanding of corneal physiology converge with new technology. One of the most notable advances was the arrival of computerised corneal topography — a non-invasive imaging technique that maps the curvature of the cornea in detail. This let optometrists detect subtle variations in shape that earlier methods missed, enabling custom-designed lenses tailored to each patient's eyes and improving both accuracy and comfort.
Together, these advances in materials, design, and fitting technology transformed Ortho-K from a niche procedure into a credible mainstream option for non-surgical vision correction — and laid the groundwork for its later role in managing myopia progression.
Milestones: FDA Overnight Approval & Digital Lens Design
The early 2000s marked a watershed moment. The U.S. Food and Drug Administration (FDA) granted approval for the use of overnight Ortho-K, a significant endorsement of its efficacy and safety and a turning point in its acceptance as a mainstream vision-correction method.
The approval was grounded in a substantial body of independent research. Numerous studies had evaluated overnight Ortho-K, demonstrating that wearing the lenses while sleeping could temporarily flatten the cornea to correct myopia — reducing the need for glasses or daytime contact lenses — and that, with proper hygiene and supervision, it was a procedure with a low risk of complications.
This opened the door to wider use, particularly among children and adolescents. Because myopia tends to progress throughout childhood, the ability to help manage that progression was an important advance in eye care.
Around the same time, digital lens-design systems revolutionised how Ortho-K lenses were crafted. Earlier designs were more generalised; digital systems allowed lenses to be designed around the exact topography of an individual's cornea, with a level of customisation and precision that was previously unattainable — especially helpful for patients with higher degrees of myopia or astigmatism.
A Turning Point: Ortho-K and Myopia Control
The FDA's endorsement and the arrival of customised lens design together pushed Ortho-K beyond simple vision correction and into the field of myopia management — the role it is best known for today.
The mechanism is thought to be linked to the way Ortho-K reshapes the cornea. By temporarily flattening the central cornea, the lenses change how light focuses on the peripheral retina, which is believed to reduce the stimulus for the eye to elongate — a key driver of myopia progression. Published studies report that Ortho-K can slow the rate of myopia progression by roughly 30–50%, with a pooled meta-analysis estimate of around 45% versus single-vision spectacle wearers. Results vary between individuals, so progression can be slowed and managed rather than guaranteed to stop.
This matters because high myopia is associated with a higher long-term risk of conditions such as retinal detachment and glaucoma. By helping to manage myopia progression during the growing years, Ortho-K may help reduce that risk later in life.
For a fuller picture of how Ortho-K fits alongside other approaches, see our dedicated guides to myopia control and the wider benefits of orthokeratology.
The Role of Technology in Ortho-K's Evolution
Advanced technology has been central to Ortho-K's progress, turning a relatively crude early method into a precise, customised treatment. Two developments have been especially influential: corneal topography and computer-aided lens design.
Advancements in Corneal Topography
Corneal topography uses specialised equipment to create a detailed map of the cornea's surface, capturing every nuance of its shape and curvature. Because the effectiveness of Ortho-K hinges on precise reshaping, this mapping lets practitioners design lenses tailored to each patient's individual corneal contours — improving both outcomes and comfort.
Computer-Aided Lens Design
Complementing topography, computer-aided design (CAD) brought a level of precision to lens manufacturing that was previously out of reach. Using the data from corneal topography, CAD allows lenses to be calibrated to apply the right amount of corneal reshaping for an individual's specific refractive error and corneal shape — enhancing effectiveness while minimising the risk of complications.
Ortho-K Around the World
Ortho-K's rise has been global, reflecting a universal need for non-invasive ways to correct vision and manage myopia.
Adoption in Asia
In East and Southeast Asian countries — particularly China, Japan, and South Korea — Ortho-K has seen significant adoption, largely driven by the high prevalence of myopia in these regions. In some urban areas of East Asia, the prevalence of myopia in young adults has been reported to be as high as 80–90%. Against that backdrop, the non-surgical nature of Ortho-K and its role in helping manage myopia progression have made it an attractive option for many families.
Expansion to Other Regions
Ortho-K's reach is not limited to Asia. In North America, Europe, and Australia, more optometrists now offer it as a treatment option, reflecting its growing reputation as a reliable, advanced method for vision correction and myopia management. The sharing of knowledge through international conferences, research, and professional networks continues to fuel its adoption worldwide.
Modern Ortho-K and What Comes Next
Today's Ortho-K lenses bear little resemblance to their early counterparts. They are crafted using sophisticated algorithms that account for the unique topography of each patient's cornea, and made from highly oxygen-permeable materials such as silicone acrylates and fluorosilicones — making overnight wear safer and more comfortable. Many patients adapt quickly and notice improved vision within the first few nights of wear. Innovations in lens design have also extended Ortho-K's scope beyond myopia to certain cases of presbyopia and hyperopia.
Looking ahead, research continues into new lens materials with even greater oxygen permeability, smart lenses that could monitor eye health, and a deeper understanding of how Ortho-K influences myopia progression — including how it might be combined with other strategies as part of a broader, holistic approach to managing myopia.
To see how these advances translate into the treatment offered today, visit our main Ortho-K page.
Frequently Asked Questions
What is Ortho-K?
Ortho-K, short for orthokeratology, is a non-surgical vision-correction method. It involves wearing specially designed, gas-permeable contact lenses overnight. These lenses gently reshape the cornea, the front surface of the eye, temporarily correcting refractive errors such as myopia, hyperopia, and astigmatism — allowing for clear vision during the day without glasses or daytime contact lenses.
How does Ortho-K help with myopia?
By gently and temporarily reshaping the cornea, Ortho-K lenses alter the way light focuses on the retina. This is thought to reduce the stimulus for the eye to elongate, which is a key factor in the progression of myopia. The effect is particularly relevant in children and adolescents, where it may help slow progression during the growing years. Learn more on our myopia control page.
Is Ortho-K safe?
Ortho-K is considered safe when carried out under the supervision of a qualified optometrist, with a thorough eye examination beforehand and regular follow-ups afterwards. Proper lens care — including cleaning and handling — is essential to reduce the risk of eye infections. As with any contact lens, there are risks involved, but these can be minimised with proper care and supervision. For a fuller discussion, see is orthokeratology safe and our Ortho-K care and maintenance guide.
Can adults use Ortho-K?
Yes. While Ortho-K is often highlighted for managing myopia progression in children, it is also an effective vision-correction option for adults — including those who are not suitable candidates for laser eye surgery or who simply prefer a non-surgical approach.
How long does it take to see results?
This varies from person to person. Some people notice improved vision after a single night of lens wear, while others may take several days to a week to reach optimal correction. The speed depends on factors such as the degree of refractive error and individual corneal characteristics.
Are the effects of Ortho-K permanent?
No. The effects are temporary. Once you stop wearing the lenses, the cornea gradually returns to its original shape and the refractive error reappears, which is why the lenses are worn regularly — typically every night. This reversibility is one of the advantages of Ortho-K, as it does not permanently alter the cornea the way laser eye surgery does.
Can Ortho-K lenses be worn during the day?
Ortho-K lenses are primarily designed for overnight wear, reshaping the cornea while you sleep. Some treatment protocols may differ depending on individual needs, so your optometrist can advise on the wearing schedule best suited to you.
Conclusion
The evolution of Ortho-K — from the first observations of corneal reshaping, through PMMA and RGP lenses, to corneal topography and computer-aided design — reflects decades of innovation, scientific inquiry, and clinical refinement. Each step has helped make Ortho-K a more effective, safer, and more accessible option for people seeking non-surgical vision correction.
Its role in managing myopia progression, particularly in children, has made it an increasingly important part of modern eye care. As research and technology continue to advance, Ortho-K is likely to play an even greater role in vision care worldwide.
If you'd like to find out whether Ortho-K is suitable for you or your child, you can book an Ortho-K consultation at our branch and speak with our optometrists.
Relevant Resources and Links
- American Academy of Ophthalmology — What is Orthokeratology?
- Peer-reviewed review on orthokeratology and myopia control (Contact Lens and Anterior Eye)
- UNSW — What is orthokeratology, and will it help slow the deterioration?
- Singapore Optometric Asssociation — What is Ortho-K? A Non-Surgical Solution for Clear Vision
- Jaycob Chin FIAOMC, Optometrist