. 2011 Nov 1;11(5):1–89.

Table 13: Change in Refractive Cylinder at 12-Months Following CXL for Keratoconus^*.

Author, Year	Eyes	Mean Refractive Cylinder (Mean Diopters ± SD)
Author, Year	Eyes	Preop	Postop	Pre-Post Change	P - Value
Arbelaez M, 2009 (50)	20	−4.04 ± 1.52 D	−2.79 ± 1.13 D	NR	0.0003
Caporossi A, 2006 (41)	44	NR	NR	−0.52 ± 0.38 D R 0.75 to −2.0 D	> 0.05
El-Raggal T, 2009 (53)	15	4.90 ± 0.74 D R 3.75 to 6.0 D	4.95 ± 0.76 D R 4.0 to 6.0 D	NR	0.384
Saffarian L, 2010 (54)	92	−3.93 ± 1.67 D	−3.14 ± 1.50 D	0.78 ± 1.49 D	< 0.001
Vinciguerra P, 2009 (42)	28	−302 ± 174 D	−2.76 ± 1.11 D		< 0.05

D indicates diopter; NR, not reported; Preop, preoperative; Postop, postoperative; R, range; SD, standard deviation.

Table 13: Change in Refractive Cylinder at 12-Months Following CXL for Keratoconus*.