Table 3.

Comparison of the posterior elevation at 4 mm and 7 mm from the center before and 3 months post-LASIK

Posterior elevation	Preoperative	Three months postoperative	P-value
Center 4 mm
Range	−24 to 33	−24 to 32	0.637
Mean ± SD	0.63 ± 14.3	2 ± 15.5
Peripheral 7 mm
Range	−197 to −21	−176 to 108	0.26
Mean ± SD	−102 ± 45.5	−80.4 ± 63

Abbreviations: SD, standard deviation; LASIK, laser-assisted in situ keratomileusis.