The device design has emerged from the observation of the space generated at the cornea when one introduces any gimmick between the lamellae of the corneal stroma. The purpose is to totally fill this "dead space" to avoid growth of the ring subjacent cells, that later undergo lipid degeneration and lead to whitish deposits (Lai MM, Tang M, Andrade EM, Li Y, Khurana RN, Song JC, Huang D., Optical coherence tomography to assess intrastromal Cornealring segment depth in keratoconic eyes. J Cataract Refract Surg. 2006 Nov;32(11):1860-5. Josef Ruckhofer, MD, Michael D. Twa, David J. Schanzlin, MD. Characteristics of lamellar channel deposits after implantation of Intacs, J Cataract Refract Surg 2000; 26:1473-1479).
Cornealring is a medical device used to treat keratoconus and other corneal diseases. It comprises several semi-circular segments of an inert material, the polymethyl methacrylate (PMMA), with length and thickness designed to fit the specific features of the eye. The device is clear so it is not easily seen at naked eye.
Cornealring is implanted at the cornea stroma, through a simple surgical procedure lasting a few minutes and carried out under topical anesthesia (only eye drops). The cornea structure is kept unchanged, sparing its optical zone (central), which is its most noble region.
The patient shows a very high satisfaction level following the Cornealring implantation. However, if results are not satisfactory, this type of procedure has the great advantage of being reversible and readjustable. Also, the procedure does not preclude future transplantation, if needed.