Abstract: A surgical knife and a method for enhancing incisions in radial keratotomy enhancement surgery on an eye having a cornea and a central optical zone, where a generally radial incision previously made in the cornea has a wall adjacent the optical zone and is to be extended centripetally toward the optical zone. The knife comprises a knife blade with an end, and the blade has a sharpened cutting edge facing in a leading direction, a recess extending inwardly from the cutting edge and from the end of the blade, and a stopping edge and a measuring edge at the recess. The stopping edge faces in the leading direction. The measuring edge has a predetermined length and extends from the cutting edge to the stopping edge. The surgical knife is inserted into a previously made incision so that the cutting edge and the stopping edge face centripetally and the end of the blade contacts a bottom portion of the incision.