Corneal Allogenic Intrastromal Ring Segments (CAIRS), or corneal allogenic intrastromal ring segments.

The implant procedure is minimally invasive, ensuring quick recovery and improving the quality of life for patients, who can enjoy better vision without the need for more invasive treatments.

What are intrastromal rings?

Intrastromal rings are specialized medical implants used in ophthalmology to correct vision defects and treat irregular changes in the structure of the cornea, such as corneal cone. These are small, clear rings, usually made of a biocompatible material such as polymethyl methyl acrylate (PMMA), which is well tolerated by eye tissues and minimizes the risk of rejection reactions.

These rings are designed to be placed in the cornea, where they gently modify the shape of the cornea by introducing additional tension at strategic locations. This process helps flatten the cornea, which is key in correcting abnormalities such as myopia and astigmatism, as well as stabilizing progressive corneal cone.

The procedure for implanting intrastromal rings is usually minimally invasive and is performed under local anesthesia. The procedure involves the precise creation of a small tunnel in the cornea using a femtosecond laser, through which a ring is then inserted. This process is precisely controlled, allowing the desired corrective effects to be achieved without deep surgical interventions.

Thanks to these features, intravitreal rings are valued in modern ophthalmology for their ability to improve patients’ quality of life, offering them better quality of vision without the need for more invasive methods of vision correction.

How do intrastromal rings work in the treatment of corneal cone?

Corneal cone is a progressive eye disease that causes thinning and irregular bulging of the cornea, leading to significant deterioration of vision. Intrastromal rings are one of the effective ways to treat this condition, by mechanically correcting the shape of the cornea.

Intrastromal rings work by gently tightening the cornea, which leads to flattening of the cornea where the rings are placed. This change in the shape of the cornea helps correct the irregular astigmatism and myopia that often accompany corneal cone. This effect helps to improve visual acuity and reduce image distortion.

By modifying the curvature of the cornea, intrastromal rings significantly improve the eye’s ability to focus light properly on the retina. As a result, the image seen by patients is clearer and more stable, which is especially important in daily activities that require good quality vision.

Many patients report an improvement in the quality of vision after intrastromal ring implantation, which is also confirmed by clinical studies. Some cases document an improvement in visual acuity to the point where glasses or contact lenses can be dispensed with, although the effects can vary depending on the severity of the disease and the patient’s individual anatomical characteristics.

The performance of intrastromal rings in the context of corneal cone treatment is an example of how modern technology can effectively support traditional methods of vision correction, offering patients an alternative to more invasive procedures such as corneal transplantation.

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When it’s a good idea to undergo treatment with intrastromal rings

Treatment with intrastromal rings is recommended for corneal cone and other corneal shape disorders.

Here are the situations in which this treatment is worth considering:

  • Early stage of corneal cone. When the early stage of corneal cone is diagnosed and the changes in corneal curvature are not yet significantly advanced, the rings can stabilize the shape of the cornea and delay further progression of the disease.
  • Irregular astigmatism. When a patient suffers from irregular astigmatism that is difficult to correct with standard methods such as glasses or contact lenses, the rings can help normalize the curvature of the cornea, which improves visual acuity.

Consultation with an experienced ophthalmologist, detailed diagnosis and examination of the patient’s corneal condition are essential to assess whether intrastromal rings are suitable for the patient.

CAIRS – intrastromal rings used to treat advanced forms of corneal conus

CAIRS represents a novel approach to treating advanced forms of corneal cone. Using allogeneic intrastromal rings that are made from recycled human tissue, these innovative implants provide natural compatibility and minimize the risk of rejection, which is crucial for those with severe corneal structural changes.

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Natural biocompatibility. CAIRS uses human corneal tissue, which ensures exceptional tolerance and minimizes the risk of allergic reactions or rejection that can occur with synthetic materials. As a result, these implants are especially recommended for patients with sensitive eyes or those who have experienced problems with other types of implants.


A minimally invasive procedure. The CAIRS implantation procedure is relatively simple and minimally invasive. It uses advanced laser technology to precisely place the rings in the cornea, minimizing the risk of complications and reducing recovery time. Patients can expect a quick return to normal activities without a lengthy healing process.

The possibility of reversing the procedure. A unique feature of CAIRS is that the procedure can be reversed, giving patients an added sense of security. In the event that the implant does not produce the desired results or there are complications, it can be removed or replaced, providing greater control over the results of the treatment.

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