TopoLink LASIK

Current ablation algorithms are either spherical (with or without periphera l transition zones) or elliptical to correct astigmatic errors.(1) They do not allow for customized treatment of such corneal irregularities as irregu lar astigmatism. The recent introduction of spot-scanning excimer lasers pr ovides the technological platform with which to perform ablations of any sh ape.(2) Corneal topography enables us to measure the shape of the individua l cornea and, possibly, to calculate an individualized ablation profile. Co uld we combine corneal topography and scanning lasers to create topographic ally guided, customized ablations? As many as 40% of human corneas demonstr ate some irregularity or asymmetry,(3) which could be improved by a customi zed ablation such as that used in Topolink laser in situ keratomileusis (LA SIK).