ABSTRACT
The desired change in corneal curvature to correct for hyperopia with current excimer laser systems is based on principles of geometric optics and the precise interaction of the excimer radiation with the corneal tissue. In comparison to myopic correction in which the goal is to flatten the central cornea, in hyperopia the central corneal area must be steepened to increase its optical power. This central steepening makes the planned correction of the hyperopic eye more difficult because the steepened central corneal portion has to join the peripheral unablated area of lower curvature via a transition area. These represent the important special features of the correction of hyperopic errors, which are emphasized in this chapter.
