Photorefractive keratectomy in patients with mild to moderate stable keratoconus: a five-year prospective follow-up study

Figures & data

Table 1 Refractive, keratometric, and topographic results

	Baseline	One month	6 months	One year	3 years	5 years
UCVA logMAR	0.76 ± 0.34	0.11 ± 0.02	0.06 ± 0.01	0.04 ± 0.009	0.046 ± 0.008	0.036 ± 0.009
P versus baseline		<0.01	<0.01	<0.01	<0.01	<0.01
BCVA logMAR	0.018 ± 0.007	0.06 ± 0.008	0.026 ± 0.002	0.031 ± 0.003	0.022 ± 0.002	0.027 ± 0.003
P versus baseline		(0.782)	(0.811)	(0.703)	(0.6015)	(0.801)
Spherical error	−2.75 ± 2.13	−0.9 ± 0.18	−0.85 ± 0.17	−0.77 ± 0.15	−0.79 ± 0.19	−0.76 ± 0.19
P versus baseline		(0.01)	(0.01)	(0.01)	(0.01)	(0.01)
Cylinder	1.23 ± 0.62	0.55 ± 0.2	0.49 ± 0.12	0.51 ± 0.19	0.52 ± 0.21	0.48 ± 0.13
P versus baseline		(0.01)	(0.01)	(0.01)	(0.01)	(<0.01)
CCT	524 ± 28	489 ± 32	491 ± 29	484 ± 31	488 ± 27	492 ± 34
P versus baseline		(0.01)	(0.02)	(0.01)	(0.01)	(0.02)
Kmax	47.1 ± 3.6	45.4 ± 3.3	45.6 ± 3.6	45.9 ± 3.2	45.7 ± 3.4	45.4 ± 3.8
P versus baseline		(0.01)	(0.01)	(0.01)	(0.01)	(0.01)
K flat	43.8 ± 1.9	42.1 ± 1.7	41.9 ± 1.5	41.7 ± 2.1	41.8 ± 2.2	42.2 ± 2.1
P versus baseline		(0.01)	(0.01)	(0.01)	(0.01)	(0.02)
K steep	45.4 ± 2.3	43.8 ± 2.5	43.5 ± 2.2	43.8 ± 2.5	43.6 ± 2.2	43.9 ± 2.6
P versus baseline		(0.01)	(0.01)	(0.01)	(0.01)	(0.01)

Abbreviations: CCT, central corneal thickness; UCVA, uncorrected visual acuity; BCVA, best-corrected visual acuity; logMAR, logarithm of the minimum angle of resolution.

Figure 1 Change in UDVA and CDVA (in decimals) over the follow-up period.

Abbreviations: UDVA, uncorrected distance visual acuity; CDVA, corrected distance visual acuity.

Figure 2 Change in keratometry over the follow-up period.