Intracorneal ring segments (ICRS) are a type of refractive surgery used to treat conditions like keratoconus, where the cornea becomes thin and irregularly shaped, or to correct mild myopia (nearsightedness). The procedure involves implanting small, crescent-shaped rings into the cornea to reshape its curvature, improving the focusing ability of the eye.

ICRS are typically used as a less invasive option for patients with early-stage keratoconus or mild refractive errors. The procedure can stabilize the cornea and improve vision without the need for a full corneal transplant.

ICRS are effective in improving vision, reducing the progression of keratoconus, and offering a less invasive solution than other more invasive treatments.