Table 2.

Summary of studies evaluating the influence of refractive surgery on biomechanical parameters.

Author	Sample (eyes)	Outcomes
		CH (mmHg)		CRF (mmHg)
Pepose et al. (2007) [25]	66 LASIK	Pre	Post	Pre	Post
		9.7 ± 1.8	8.0 ± 1.6	9.5 ± 1.9	6.7 ± 1.7
Ortiz et al. (2007) [4]	65 LASIK	Pre	Post	Pre	Post
		10.44 ± 1.74	9.3 ± 1.9	10.07 ± 1.97	8.1 ± 1.8
Hamilton et al. (2008) [81]	32 LASIK (flap with femtosecond):	CH decreased 1.9 mmHg
	33 LASIK (flap with microkeratome):	CH decreased 2.2 mmHg
	32 PRK:	CH decreased 2.3 mmHg
Franco and Lira (2009) [30]	63 control	10.8 ± 1.53		10.6 ± 1.71
	20 LASIK	8.5 ± 1.22		7.7 ± 0.97
Qazi et al. (2009) [82]		Pre	Post	Pre	Post
	15 LASEK	9.06 ± 1.56	7.16 ± 1.99	8.61 ± 1.76	5.95 ± 2.41
	14 LASIK	10.00 ± 1.77	8.57 ± 2.25	9.87 ± 1.97	7.35 ± 2.49
Kamiya et al. (2009) [84]	36 LASIK	Pre:	10.6	Pre:	10.0
		Post:		Post:
		1 week:	8.6	1 week:	7.3
		1 month:	9.0	1 month:	7.6
		3 months:	9.0	3 months:	7.8
		6 months:	8.9	6 months:	7.7
Kamiya et al. (2009) [83]		Pre	Post	Pre	Post
	27 LASIK	10.8	8.6	10.3	7.7
	31 PRK	10.8	9.2	10.3	8.4
Shah and Laiquzzaman (2009) [85]	110 LASIK	Pre:	Post:	Pre	Post
		11.4	9.2	10.0	7.6
Chen et al. (2010) [86]	60 LASIK	Pre:	10.59 ± 1.02	Pre:	8.80 ± 1.45
		Post:		Post:
		1 day:	8.16 ± 0.84	1 day:	5.02 ± 1.16
		10 days:	8.14 ± 0.77	10 days:	4.96 ± 0.98
		1 month:	8.33 ± 0.88	1 month:	5.08 ± 1.31
		3 months:	8.47 ± 0.78	3 months:	5.26 ± 0.96
Ryan et al. (2011) [87]	102 epi-LASIK	Pre:	10.22	Pre:	10.01 ± 1.80
		Post:		Post:
		1 month:	8.17 ± 1.25	1 month	7.82 ± 1.68
		3 months:	8.46 ± 1.44	3 months:	8.03 ± 1.85
		6 months:	8.63 ± 1.31	3 months:	7.77 ± 1.50
		12 months:	8.53 ± 1.49	3 months:	7.80 ± 1.66

CH: corneal hysteresis; CRF: corneal resistance factor.