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

Table 6

Comparison of changes over 12-month period in visual, refractive, aberrometric, and topographical parameters between the 2 studied groups.

Parameters	G1	G2	value
ΔUDVA (logMAR)	−0.74 ± 0.31	−0.83 ± 0.38	0.33
ΔCDVA (logMAR)	−0.19 ± 0.16	−0.24 ± 0.15	0.59
ΔRefractive sphere (D)	1.67 ± 1.16	1.48 ± 1.22	0.37
ΔRefractive cylinder (D)	1.7 ± 1.11	1.9 ± 1.38	0.71
ΔMRSE (D)	2.4 ± 1.91	3.00 ± 1.82	0.53
ΔTotal RMS	−3.1 ± 1.2	−3.2 ± 1.3	0.83
ΔHOA RMS	−0.44 ± 0.22	−0.41 ± 0.31	0.64
ΔContrast sensitivity (%)	18.9 ± 7.4	20.2 ± 7.9	0.56
ΔGlare (%)	17 ± 6.8	19.6 ± 7.3	0.22
Δ (D)	−2.3 ± 1.6	−2.00 ± 1.7	0.61
Δ (D)	−3.8 ± 1.7	−3.6 ± 1.8	0.46
Δmax (D)	−3.5 ± 2.1	−3.1 ± 1.9	0.89
ΔMCT	−45 ± 23.1	−42 ± 21.9	0.16

: unpaired -test for comparison between the 2 groups.
UDVA: uncorrected distant visual acuity.
CDVA: corrected distant visual acuity.
max: maximum keratometry.
MRSE: mean refractive spherical equivalent.
Total RMS: total root mean square.
HOA RMS: high order aberration root mean square.
D: diopter.