Table 1.

Pre-and postoperative visual and keratometric data

(N=eyes)	Preop (25)	1 month (25)	3 months (25)	6 months (25)	12 months (25)	24 months (25)	36 months (23)	42 months (23)	P-valuea
Visual acuity data
UDVA
Average±SD	0.27±0.21	0.51±0.14	0.75±0.10	0.82±0.10	0.86±0.08	0.85±0.10	0.86±0.08	0.85±0.10	0.0008*
Range	0.10–0.60	0.40–0.80	0.60–1.00	0.80–1.00	0.80–1.00	0.80–1.00	0.80–1.00	0.80–1.00
CDVA
Average±SD	0.55±0.32	0.74±0.18	0.82±0.1	0.95±0.10	1.02±0.07	1.02±0.07	1.03±0.08	1.05±0.09	<0.0001*
Range	0.10–1.00	0.50–1.00	0.80–1.20	0.80–1.00	1.00–1.20	1.00–1.20	1.00–1.20	1.00–1.20
Anterior keratometry (K) measured by Scheimpflug device
K1 (flat)b
Average±SD	47.67±3.78	45.02±4.82	44.01±3.76	43.46±2.91	42.28±3.37	42.12±2.97	42.21±3.73	42.17±3.88	<0.0001*
Range	40.30–62.90	40.80–55.10	38.40–54.90	40.81–53.88	39.12–52.10	40.17–51.97	39.98–51.99	39.97–51.87
K2 (steep)b
Average±SD	54.18±4.17	51.23±3.65	48.04±3.79	46.10±4.12	45.21±3.38	45.11±4.97	45.07±4.24	45.04±4.31	<0.0001*
Range	45.70–75.84	44.10–66.30	41.99–61.22	40.18–60.18	39.52–59.44	39.52–60.03	39.54–59.71	39.51–59.67
Anterior surface topometric indices
ISV
Average±SD	119.66±47.29	79.50±40.07	73.21±39.21	70.11±37.24	68.97±38.17	67.31±37.30	65.91±39.42	65.47±39.27	0.0001*
Range	18–204	19–187	19–185	19–185	17–185	17–185	16–185	16–185
IHD
Average±SD	0.155±0.065	0.045±0.042	0.041±0.042	0.041±0.042	0.040±0.042	0.040±0.042	0.040±0.042	0.040±0.042	<0.0001*
Range	0.049–0.262	0.035–0.198	0.025–0.187	0.025–0.187	0.025–0.185	0.025–0.185	0.025–0.185	0.025–0.185

Notes:

^aP-value at 1 year compared to preoperative values;

^bAll units in keratometric diopters (D);

^*Statistically significant, P<0.05.

Abbreviations: CDVA, corrected distance visual acuity; IHD, index of height decentration; ISV, index of surface variance; Preop, preoperative; UDVA, uncorrected distance visual acuity (decimal).