Table 2.
Postoperative results
| PRK (n=100 eyes) | tPRK (n=100 eyes) | P value* | |||||
|---|---|---|---|---|---|---|---|
| Right eyes | Left eyes | All eyes | Right eyes | Left eyes | All eyes | ||
| UCDVA (decimal), mean ± SD | |||||||
| Day 4 | 0.53 ± 0.09 | 0.53 ± 0.09 | 0.53 ± 0.09 | 0.73 ± 0.17 | 0.71 ± 0.17 | 0.72 ± 0.17 | < 0.001 |
| Day 7 | 0.62 ± 0.09 | 0.63 ± 0.08 | 0.63 ± 0.08 | 0.87 ± 0.19 | 0.84 ± 0.17 | 0.86 ± 0.18 | < 0.001 |
| 6w | 1.09 ± 0.07 | 1.1 ± 0.07 | 1.1 ± 0.07 | 1.1 ± 0.071 | 1.1 ± 0.07 | 1.1 ± 0.07 | > 0.05 |
| BCDVA (decimal), mean ± SD, 6w | 1.21 ± 0.17 | 1.21 ± 0.16 | 1.21 ± 0.16 | 1.18 ± 0.15 | 1.18 ± 0.16 | 1.18 ± 0.15 | > 0.05 |
| Refractive error (D), mean ± SD, 6w | |||||||
| Sphere | 0.34 ± 0.28 | 0.30 ± 0.27 | 0.32 ± 0.27 | 0.22 ± 0.28 | 0.23 ± 0.27 | 0.21 ± 0.30 | > 0.05 |
| Cylinder | - 0.24 ± 0.13 | - 0.25 ± 0.17 | - 0.23 ± 0.14 | -0.25 ± 0.26 | -0.27 ± 0.32 | - 0.21 ± 0.21 | > 0.05 |
| SE off target | 0.13 ± 0.28 | 0.10 ± 0.28 | 0.12 ± 0.28 | 0.03 ± 0.21 | 0.03 ± 0.21 | 0.03 ± 0.21 | > 0.05 |
| Pain Score (0-15), mean ± SD | 10.4 ± 1.37 | 11.16 ± 1.42 | 10.8 ± 1.44 | 5.80 ± 3.00 | 5.00 ± 2.70 | 5.4 ± 2.84 | < 0.0001 |
| Epithelial healing (hours), mean ± SD | 60.2 ± 8.02 | 58.0 ± 5.15 | 59.10 ± 6.79 | 47.12 ± 9.22 | 44.40 ± 9.58 | 45.76 ± 9.46 | < 0.0001 |
BCDVA best corrected distance visual acuity, D diopter, UCDVA uncorrected distance visual acuity, PRK photorefractive keratectomy, tPRK transepithelial photokeratectomy, SE spherical equivalent, SD standard deviation, w weeks
*p-value refers to comparison of PRK (all eyes) and tPRK (all eyes)