Intracorneal ring segments (Intacs or ICRS) are devices used in a form of refractive surgery that treats mild nearsightedness. Intacs are crescent-shaped plastic rings are that are placed in the eye on the outer edge of the cornea. The technique involves making a small incision in the cornea of the eye, and stitches are not required. The rings work by flattening the cornea so that light rays can better focus on the retina.
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