Stern D, Lin W Z, Puliafito C A, Fujimoto J G
Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts.
Invest Ophthalmol Vis Sci. 1989 Jan;30(1):99-104.
Excimer laser ablation has been proposed as a technique for keratorefractive surgery. Clinical acceptance of linear-incision laser keratectomy may depend on the availability of a method for accurately and noninvasively monitoring incision depth during the ablation process. We have developed a femto-second optical ranging technique for measurement of corneal incision depth. This technique uses nonlinear optical cross-correlation to determine the time-of-flight of an ultrashort laser pulse between the anterior corneal surface and the bottom of the keratectomy incision. Longitudinal and transverse resolution are estimated to be 5 micron and 10 micron, respectively.
