Table 1.

Results of univariate analysis evaluating the effect of various patterns of HS on corneal parameters

	Spherical Equivalent		J0		J45		K1		K2
	Coefficient	P	Coefficient	P	Coefficient	P	Coefficient	P	Coefficient	P
Circumferential	−7.06	0.13	−0.51	0.20	−0.004	0.87	−0.97	0.5	1.74	0.12
Horizontal	5.17	0.19	1.14	0.68	0.17	0.42	−0.31	0.79	-1.46	0.12
Horse Shoe	−4.48	0.30	−0.47	0.19	−0.004	0.98	−0.006	0.99	-1.038	0.32
Oblique	3.8	0.5	0.58	0.22	0.41	0.17	0.26	0.87	0.26	0.85
Vertical	2.5	0.6	0.48	0.23	−0.5	0.045	1.23	0.39	1.44	0.21

HS=Haab's Striae, J0 is the Jackson cross-cylinder power at axis 90° and 180°. In this representation, positive values of J0 indicate with-the-rule (WTR) astigmatism, and negative values indicate against-the-rule (ATR) astigmatism. J45 is the Jackson cross-cylinder power at axis 45° and 135° and represents oblique astigmatism