Table 1.

Pretreatment and posttreatment corneal astigmatism in computational simulations of 4 candidate stiffening patterns. All values are derived from simulated K values.

		Posttreatment Astigmatism (D)				Change (D)
Parameter	Pretreatment Astigmatism (D)	Rounded Bow-tie (Pattern 1)	Butterfly (Pattern 2)	Center-Sparing Butterfly (Pattern 3)	Linear Bow-tie (Pattern 4)	Pattern 1	Pattern 2	Pattern 3	Pattern 4
Patient
1	2.69	1.70	1.77	2.21	1.59	–0.99	–0.92	–0.48	–1.10
2	2.21	1.11	1.17	1.64	1.09	–1.10	–1.04	–0.57	–1.12
3	3.92	2.91	2.93	3.39	1.97	–1.01	–0.99	–0.53	–1.12
4	3.07	2.02	2.05	2.52	2.8	–1.05	–1.02	–0.55	–1.10
5	1.22	0.67	0.43	0.82	0.35	–0.55	–0.79	–0.40	–0.92
6	2.75	2.32	2.35	2.49	1.66	–0.43	–0.40	–0.26	–1.09
7	2.38	2.28	2.24	2.29	1.64	–0.10	–0.14	–0.09	–0.74
8	2.10	0.97	1.03	1.52	0.95	–1.13	–1.07	–0.58	–1.15
9	2.79	2.00	2.01	2.34	1.69	–0.79	–0.78	–0.45	–1.10
10	1.37	1.05	1.08	1.03	0.17	–0.32	–0.29	–0.34	–1.23
Statistic
Mean	2.45	1.70	1.71	2.03	1.25	–0.75	–0.74	–0.43	–1.20
SD	0.79	0.73	0.76	0.77	0.7	0.37	0.34	0.16	0.45
P value*	—	—	—	—	—	<.001	<.001	<.001	<.001

^*Student t test of pretreatment to posttreatment change in astigmatism