Table 1.

Ablation spherical equivalent (SE) predicted from the central to semiperipheral corneal thickness ratio (CPT ratio) calculated from the precomputed values obtained from the pentacam user interface software.

CPT ratio	SE (D)
0.67	−10.5
0.69	−9.4
0.71	−8.2
0.73	−7.1
0.75	−5.9
0.77	−4.8
0.79	−3.6
0.81	−2.5
0.83	−1.3
0.85	−0.2
0.87	1.0
0.89	2.1
0.91	3.3
0.93	4.5
0.95	5.6

D = dioptre; CPT = central to semiperipheral; SE = spherical equivalent.