Definition of Intracorneal Ring Segments

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.

ICRS also treat keratoconus, a condition that results in progressive vision loss from thinning and irregularity in the cornea of the eye.