CPT® Code 0099T

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Intrastromal corneal ring segments are specialized medical devices designed to enhance visual acuity by altering the shape of the cornea. These segments are micro-thin, flexible, crescent-shaped inserts made from polymethylmethacrylate, a biocompatible material. The implantation of these segments involves creating small incisions in the cornea, followed by the formation of channels using either a laser or a specialized dissecting instrument. Once the channels are prepared, one or two corneal ring segments are inserted into each channel, with the thickness of the segments chosen based on the specific degree of correction required for the patient. The primary function of these implants is to flatten the curvature of the anterior cornea, which in turn modifies the eye's refractive properties, leading to improved vision. This procedure is particularly beneficial for individuals suffering from myopia (nearsightedness) and astigmatism, especially those who have previously undergone refractive laser surgery and are experiencing complications such as corneal ectasia or keratoconus. By providing a mechanical alteration to the corneal structure, intrastromal corneal ring segments offer a viable option for enhancing visual outcomes in these patients.