Table 3.

Comparison of Refractive Outcomes and Visual Acuity Before and After T-PRK

	Preoperative (Mean ± SD)	Postoperative (Mean ± SD)	Mean Difference (Mean ± SD)	p-value
Sphere (D)
Group A	−1.35 ± 0.69	0.24 ± 0.36	−1.59 ± 0.83	0.000*
Group B	−2.24 ± 0.36	−0.21 ± 0.32	−0.31 ± 0.67	0.000*
Group C	−3.70 ± 1.16	0.28 ± 0.37	−1.87 ± 0.46	0.000*
Cylinder (D)
Group A	−0.56 ± 0.47	−0.25 ± 0.39	−2.45 ± 0.61	0.006*
Group B	−0.93 ± 0.66	−0.28 ± 0.36	−0.64 ± 0.76	0.000*
Group C	−1.00 ± 0.97	−0.48 ± 0.52	−2.62 ± 0.49	0.002*
Spherical Equivalent (D)
Group A	−1.82 ± 0.38	0.05 ± 0.32	−3.98 ± 1.25	0.000*
Group B	−2.66 ± 0.48	−0.03 ± 0.18	−0.51 ± 1.13	0.000*
Group C	−4.13 ± 1.25	0.00 ± 0.28	−4.13 ± 1.32	0.000*
Visual Acuity	n (%)	n (%)		p-value#
Group A	2 (5.1)	39 (100)	-	0.000*
Group B	1 (3.4)	29 (100)	-	0.000*
Group C	0	51 (98.1)	-	-
p-value$	0.280	0.899

Notes: Statistical tests applied: Paired t-test. ^#Mc Nemar’s test, ^$chi square test. *Indicates statistically significant difference.

Abbreviation: D, diopter.