A Novel Role for Corneal Pachymetry in Planning Cataract Surgery by Determining Changes in Spherical Equivalent Resulting from a Previous LASIK Treatment

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.