Table 2. Comparisons of astigmatism cylinder, spherical equivalent (SE), and corneal curvature components between eyes of preterm children with laser-treated threshold retinopathy of prematurity and age-matched full-term controls.

	ROP eyes	Age-matched controls	P-value
	(N=46)	(N=1021)
Astigmatism cylinder*, D	3.47±1.92	0.08±0.90	<0.001
Spherical equivalent (SE)*,D	−4.49±3.76	−0.44±1.48	<0.001
Vertical CR (VCR)**, mm	7.46±0.38	7.67±0.35	0.003
Horizontal CR (HCR)***, mm	7.98±0.35	7.88±0.28	0.031
Mean corneal radius (CR), mm	7.73±0.34	7.76±0.45	0.650
Astigmatism steep axis,o	89.30±7.24	83.63±21.49	0.08

P-value <0.05 is statistically significant.

Data are presented as the mean±SD.

*P value <0.001.

**P value <0.01.

***P value <0.05.