Table 4. Topographical parameters of the studied patients preoperatively and 3 and 6mo following the full procedure.

Measure	Preop. measure	Pa; preop. vs 3mo after PRK	3mo after PRK	Pa; preop. vs 6mo after PRK	6mo after PRK	P; repeated measure ANOVA
K1 (D)	44.3±1.72	0.003	43.1±1.31	0.002	43.1±1.30	<0.001
K2 (D)	48.9±2.34	<0.001	44.2±1.22	<0.001	44.1±1.26	<0.001
Kmax (D)	49.3±3.9	<0.001	45.4±4.6	<0.001	45.2±4.3	<0.001
Q	-0.71±0.33	<0.001	-0.28±0.21	<0.001	-0.28±0.23	<0.001
MCT	472±35	<0.001	419±22	<0.001	421±28	<0.001
ISV	45.7±23.8	<0.001	39.6±22.9	<0.001	39.2±23.1	<0.001
IVA	0.46±0.31	0.09	0.45±0.28	0.08	0.45±0.29	0.06
IHA	21.7±10.6	0.68	21.5±10.8	0.70	21.2±11.1	0.77
Rmin	6.8±0.55	<0.001	7.3±0.49	<0.001	7.4±0.43	<0.001
KI	1.3±0.09	0.002	1.05±0.1	0.001	1.074±0.1	<0.001

^aPaired t-test (Wilcoxon signed-rank test); Kmax: Maximum keratometry; Q: Corneal asphericity; MCT: Minimum corneal thickness; ISV: Index of surface variance; IVA: Index of vertical asymmetry; IHA: Index of height asymmetry; Rmin: Minimum radius of curvature; KI: Keratoconus index.

mean±SD