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Corneal Ring Implants



Corneal Implants (Inlays and Rings)
What are corneal rings implants/inserts?
Corneal implants are flexible, crescent-shaped rings of polymethyl methacrylate that are placed in the periphery of the cornea. They affect refraction in the eye by physically changing the shape of the cornea, flattening the front of the eye, and so correcting the irregular corneal shape.
There are various types of corneal rings (INTACS, Kerarings, or Ferrara rings). All types are offered at Eye Clinic London by our surgeon Mr Samer Hamada.
What is it used for?
Corneal rings like INTACS, FERRARA OR KERNING are used in cases of corneal ectasia (thinning and weakness of the cornea) which can be congenital corneal dystrophy such as keratinous and pellucid marginal degeneration or acquired like after corneal laser refractive surgery or corneal disease.
Keratoconus is the most common form of corneal ectasia. It is a progressive disease in which the normal cornea becomes more irregular in shape over time resulting in astigmatism, and can progress to a stage where the cornea becomes thinner and begins to bulge into a cone-like shape.
What does the procedure involve?
The procedure is undertaken under local anaesthesia. An incision is made in the cornea and channels are created in it by by using a femtosecond laser to ensure high precision. One to two corneal implant segments are introduced into the channel. Various implants with a range of implant thicknesses are available at Eye Clinic London for different degrees of correction and that is why it is sometimes called prescription corneal inserts.
Do you offer combined Corneal Cross Linking (CXL) and Corneal Rings?
In our experience, the combined procedure of corneal rings and corneal cross linking works very well to stop/slow keratoconus or post LASIK/LASEK corneal ectasia (corneal instability after laser vision correction such as LASIK / LASEK / or PRK). The two procedures are done on two different settings to maximise results and reduce risks.
What about long term?
Corneal rings are designed to remain permanently in the eye, yet they can also be removed or replaced if needed.
Who Shouldn’t have the procedure?
Corneal rings implants should not be implanted if:
• The cornea is very thin
• You have autoimmune or immunodeficiency diseases (for example: lupus, rheumatoid arthritis, AIDS)
• You are pregnant or nursing
• You have known conditions of the eye that may increase the likelihood of future problems
• You are taking special prescription medications, such that may affect corneal healing or your vision.You should discuss all medications you take, even over-the-counter medications, with your surgeon at Eye Clinic London.
If you know that you have keratoconus or corneal ectasia disease and would like to discuss your options with Mr Samer Hamada, who is an internationally renowned surgeon with vast experience in complex corneal diseases in particular keratoconus and corneal ectasia after LASIK or LASEK; then call Eye Clinic London on 0800 197 8808 or email
This is where expertise plays a role in the outcomes. Eye Clinic London surgeons have been performing high quality surgeries using femtosecond laser to implant corneal rings for many years.
We audit our results regularly to enable us to improve our outcomes. Patient satisfaction is what matters at the end and we thrive on delivering best treatments to meet that goal.
The corneal implants (inlays and rings) such as INTACS and Ferrara can be used to correct astigmatism and reshape the cornea in patients with ecstatic corneal disease whether keratoconus or corneal ectasia after laser refractive surgery such as LASIK.
Further information about corneal rings can be found in our Keratoconus page.