Table 2.

Summary of the visual, refractive, corneal topographic and tomographic outcomes after Keraring implantation for keratoconus in patients older than 40 years

	Pre-op	Post-op	P
UDVA (logMAR)	0.94 ± 0.1	0.76 ± 0.28	0.01
CDVA (logMAR)	0.41 ± 0.27	0.2 ± 0.2	0.01
Spherical equivalent (D)	− 11.65 ± 4.48	− 4.44 ± 3.9	0.005
Corneal astigmatism (D)	− 4.48 ± 3.74	− 2.75 ± 2.18	0.01
Kmax (D)	63.24 ± 10.57	60.15 ± 6.25	0.02
Kmean (D)	51.40 ± 5.50	48.43 ± 5.28	0.02
CCT (μm)	466.54 ± 38.8	472.9 ± 37.5	0.3
Corneal thinnest point (μm)	449.0 ± 38.54	459.3 ± 38.7	0.2

Pre-op preoperatively, Post-op postoperatively, UDVA uncorrected distance visual acuity, CDVA corrected distance visual acuity, Kmax maximal keratometry, Kmean mean keratometry, CCT central corneal thickness, CTP corneal thinnest point. p < 0.05 was considered statistically significant