An implantable arc designed to flatten the anterior corneal curvature, without disturbing the visual axis, to correct certain corneal-related visual disorders. It is typically a plastic arc, of about 150 degrees and provided in pairs, inserted into the cornea via an intrastromal channel created with a diamond knife or laser, and that can be implanted away from the radial incision to minimize complications. It is typically available in sizes from 0.25 to 0.35 mm. The device is intended to correct mild and moderate myopia and to treat patients with irregular astigmatism as a result of keratoconus, especially those who can no longer benefit from contact lenses or spectacles.