Intracorneal_rings
Intrastromal corneal ring segment
Small device implanted in the eye to correct vision
An intrastromal corneal ring segment (ICRS) (also known as intrastromal corneal ring, corneal implant or corneal insert) is a small device surgically implanted in the cornea of the eye to correct vision. Two crescent or semi-circular shaped ring segments are inserted between the layers of the corneal stroma, one on each side of the pupil,[1] This is intended to flatten the cornea and change the refraction of light passing through the cornea on its way into the eye.