Intrastromal corneal ring segments
Intrastromal corneal ring segments (Intacs ) are a medical device designed to reduce the amount of myopia and astigmatism present in patients with keratoconus. These ring segments, Intacs result in a reduction of the steepening of the cone by inducing a flattening of the cornea. They are placed in the periphery of cornea outside of the central optical zone. Intacs are inserted two-thirds depth into the cornea through a small radial incision, created by a femtosecond laser. Intacs are manufactured from polymethylmethacrylate (PMMA) and are available in different sizes. The placement and size of the Intacs are customized to each patient. This procedure can often be helpful in patients with keratoconus to restore vision, without the need for corneal transplantation.