Table 3.

FOZ and IOZ changes after WFO or WFG LASIK

Variable	Group A ( n = 50)	Group B ( n = 50)	P- v a lue *
FOZ diameter (mm), Mean ± SD (Range)	4.32 ± 0.94 (3 to 6)	4.16 ± 1.13 (3 to 6)	0.622
Mean zonal EKR (D), Mean ± SD (Range)	38.21 ± 1.55 (34.99 to 41.04)	39.78 ± 2.08 (36.2 to 43.8)	< 0.001
IOZ Changes (mm), Mean ± SD (Range)	1.68 ± 0.94 (0 to 3)	1.84 ± 1.13 (0 to 3)	0.254
FOZ % achieved, Mean ± SD (Range)	71.99 ± 15.68 (50 to 100)	69.33 ± 18.78 (50 to 100)	0.443

Abbreviations: FOZ, functional optical zone; SD, standard deviation; EKR, Holladay Equivalent K Reading; D, diopter; IOZ, intended optical zone; IOZ changes, IOZ – FOZ; LASIK, laser in situ keratomileusis. Values of P < 0.05 are shown in bold. Independent t-test. Note: Group A, wavefront-optimized (WFO); Group B, wavefront-guided (WFG).