Abstract: The intracorneal ring is made up of a suitable material deformable with compression and with an appropriate molecular memory so that, being at rest, it can take the shape of a ring. The ring has an outside diameter between 5 and 7 mm, a wall thickness between 0.25 and 0.4 mm, and an inner diameter of about 4.5 to 6.2 mm. When dealing with the keratoconus treatment, the ring is placed in a concentric position with respect to the cone apex and inside the thickest area of the cornea. In the astigmatism correction, it is placed in a pocket done in the corneal stroma, thus behaving as a curvature modifier of the cornea anterior face.

Abstract: A guide for attaching to a router to form arcuate cuts in a workpiece. The router guide has a circular mounting plate which replaces a lower plate of a router. The guide has an elongated arm extending from the mounting plate with a slot extending along the longitudinal center line of the guide arm. An anchoring mechanism slidably carried in the slot includes an anchor fastener such as a wood screw or nail to anchor the anchoring mechanism to the workpiece and define a pivot point for the router and guide. The anchoring mechanism further includes a locking mechanism to releasably lock the anchoring mechanism in place along the slot to define the radius of travel of the router and guide about the pivot point.