Simultaneous versus Sequential Accelerated Corneal Collagen Cross-Linking and Wave Front Guided PRK for Treatment of Keratoconus: Objective and Subjective Evaluation

Table 1

Demographic information of the population enrolled in the study.

Parameter	Values
	G 1	G 2
Number of patients (eyes)	30 (30)	32 (32)	—
Sex (male : female)	14 : 16	15 : 17	—
Mean age ± SD, years	26.3 ± 4.2	24.8 ± 5.5	0.33
Age range, years	21 to 31	22 to 33	—
Gender (male/female)	6/8	7/6	—
Mean refractive cylinder ± SD, D	−2.9 ± 1.6	−2.7 ± 1.4	0.23
Range of refractive cylinder, D	−1.25 to −4.25	−1.4 to −4.3	—
Mean refractive sphere ± SD,	−2.2 ± 1.82	−1.8 ± 1.56	0.12
Range of refractive sphere, D	−0.50 to −3.75	−0.25 to −3.9	—
MRSE (D)	−3.7 ± 2.4	−3.8 ± 2.6	0.52
max D	49.1 ± 4.1	48.3 ± 5.4	0.34
Thinnest pachymetry, um	466 ± 42	475 ± 49	0.81

: unpaired -test for comparison between the 2 groups.
D: diopter.
MRSE: mean refractive spherical equivalent.
max: maximum keratometry.