About The Procedure


Orthokeratology, or Ortho-K, is a non-surgical and reversible procedure that uses specially designed gas-permeable contact lenses to gently reshape the cornea while you sleep. Upon removal when you wake up, you’ll experience clear vision throughout the day without any lenses in your eyes.

Ortho-K lenses gently reshape the cornea using a thin layer of tear film, applying positive and negative pressure across the corneal surface to mold it to the appropriate shape. When these pressures are balanced perfectly along the cornea, we call it being in a state of equilibrium – that is where its complexity lies as every cornea is different, power correction will differ, and patient’s needs may differ.

Our Difference

Our Experience

At the heart of our work is a deep passion for improving the vision and quality of life of our patients. We understand the challenges that come with wearing glasses and contacts, and we know the difference that a clear and comfortable vision can make.

With over a decade of experience in orthokeratology, we have seen first-hand the transformative impact that this technology can have on our patients’ lives, not just in correcting their vision but also in controlling their myopia progression. But we also know that the process of designing and fitting ortho-k lenses can be complex and time-consuming, requiring a high level of expertise and training.

Our Solution

That’s why we have dedicated ourselves to developing a simpler, more accurate, and safer way to design and fit ortho-k lenses, using advanced AI technology. Our innovative software streamlines the process, analysing corneal topography measurements to ensure a perfect fit for each individual cornea. And with our proprietary processes and advanced algorithms, we are able to design lenses down to the micron to achieve perfect equilibrium, leading to optimal visual outcomes and ocular health.

Our AI software isn’t just for ortho-k lenses. With our extensive clinical expertise, we are also able to treat adults with myopia, presbyopia, and post-laser correction eyes. By providing a comprehensive solution for vision correction, we aim to make clear and comfortable vision accessible to more people than ever before.

Our Cause

We believe that this technology has the power to change lives and revolutionize the field of vision correction. We are committed to continuing our research and development efforts, and to partnering with leading eye care practitioners to bring this innovative technology to more patients around the world.

Our Brand

KALCULUS epitomizes the marriage of mathematical precision and ocular innovation, crafting a transformative journey where intelligence converges with calculus to redefine the way the world sees, aiming to be a beacon for people embarking on this journey.


94%

of patients likely to recommend KALCULUS to a friend of a family member

93%

of patients were happy with their facial appearance without spectacles

90%

of patients contented with their vision

90%

of patients either did not experience or only occasionally experienced mild symptoms

86%

of patients felt able to do things they wanted without spectacles