Table 2. Postoperative UCVA, BCVA, and keratometry.

Parameters	Simultaneous TG-PRK (n=15)	Sequential TG-PRK (n=19)	Simultaneous non-TG-PRK (n=17)	Sequential non-TG-PRK (n=18)	P
UCVA, logMAR
1y	0.01±0.07	0.01±0.07	0.02±0.08	0.03±0.15	0.81
3y	0.01±0.07	0.01±0.07	0.03±0.08	0.02±0.08	0.66
6y	0.02±0.06	0.01±0.07	0.03±0.08	0.02±0.08	0.74
BCVA, logMAR
1y	0.01±0.18	0.01±0.05	0.02±0.17	0.02±0.05	0.57
3y	0.01±0.05	0.01±0.05	0.02±0.05	0.02±0.06	0.26
6y	0.02±0.05	0.01±0.05	0.02±0.05	0.02±0.06	0.80
Steep K, D
1y	44.45±0.83	44.76±0.92	45.18±0.87	45.18±0.83	0.01
3y	44.52±0.93	45.02±0.71	45.35±0.77	45.33±0.77	0.01
6y	44.50±0.94	45.16±0.73	45.47±0.79	45.48±0.73	0.01
Flat K, D
1y	42.01±0.63	42.73±1.25	43.28±0.93	43.21±0.85	0.01
3y	42.08±0.68	42.84±1.22	43.52±0.82	43.36±0.82	0.01
6y	42.02±0.82	42.84±1.18	43.58±0.89	43.36±0.82	0.01

K: Keratometry; UCVA: Uncorrected visual acuity; BCVA: Best corrected visual acuity; TG-PRK: Topography-guided photorefractive keratectomy.

mean±SD