Table 4.

Preoperative clinical features and cross-linking outcomes at 3 months of patients with keratoconus and postoperative corneal ectasia (mean ± sd)

Keratoconus (n=27)	CDVA (ETDRS letters)	SE (D)	Sim-Ks (D)	K-Max (D)	Thinnest CT (µm)
Pre OP	32.6±11.6	−5.24±4.34	50.28±4.33	59.90±7.91	440±55
3 months post CXL	40.2±10.4	−3.91±4.04	49.05±4.34	58.63±8.86	411±54
	p=0.01	p=0.2	p=0.9	p=1	p=0.04
Postoperative Corneal Ectasia (n=30)
Pre Op	37.79±10.64	−3.37±4.23	46.39±4.04	55.54±6.17	433±67
3 months post CXL	43.54±10.15	−3.02±4.35	44.56±9.62	54.19±7.02	407±64
	p=0.04	p=0.7	p=0.3	p=0.8	p=0.04

CXL – Corneal collagen cross-linking

SD – Standard deviation

D – Diopters

µm – micrometers

SE – spherical equivalent manifest refraction

CDVA – Total number of letters seen with best spectacle correction and distance target

Sim-K – Mean Sim-Ks measured by Scheimpflug tomography

K Max – Steepest corneal curvature measured by Scheimpflug tomography

Thinnest CT – Corneal thinnest point measured by Scheimpflug tomography