The intrastromal corneal ring is adjustable in thickness and has an elongated, flexible, preferably transparent or translucent body which forms a circle. The intrastromal corneal ring is of a size such that it can be inserted into a human eye and is comprised of a material which is compatible...http://www.google.com/patents/US5693092?utm_source=gb-gplus-sharePatent US5693092 - Adjustable devices for corneal curvature adjustment
