Figure 1. Topography software can be used to simulate the fluorescein pattern of how the recommended lens would look on the eye. It then allows the clinician to adjust the parameters (BC, RZD, LZA) to find the best fit.

Figure 2. Demonstrating the three curves of an orthokeratology lens on the cornea: base curve (BC), return zone depth (RZD), and landing zone angle (LZA).

Figure 3. Ideal bull’s-eye pattern fluorescein of well- fitting lens on eye.

Figure 4. Topography results showing excellent centration achieved as seen with bull’s-eye appearance.

Figure 5. Difference map comparing pre-treatment topograpy and topography performed at the one-week visit.