Table 3.
Efficacy, predictability, and safety comparisons of PRK and thin-flap LASIK
| Parameter |
Postoperative month 1 |
Postoperative month 3 |
Postoperative month 6 |
||||||
|---|---|---|---|---|---|---|---|---|---|
| PRK (n = 25) | TF LASIK (n = 25) | P valuea | PRK (n = 25) | TF LASIK (n = 25) | P valuea | PRK (n = 25) | TF LASIK (n = 25) | P valuea | |
| Efficacy (UDVA) | 0.009 | 0.699 | 0.718 | ||||||
| 20/15 or better | 1 (4) | 7 (29) | 11 (44) | 12 (48) | 9 (38) | 13 (54) | |||
| 20/20 or better | 11 (44) | 21 (84) | 24 (96) | 23 (92) | 24 (96) | 23 (92) | |||
| 20/25 or better | 19 (76) | 24 (98) | 25 (100) | 23 (92) | 25 (100) | 24 (96) | |||
| 20/30 or better | 23 (92) | 24 (98) | 25 (100) | 25 (100) | |||||
| 20/40 or better | 24 (96) | 25 (100) | |||||||
| 20/50 or better | 25 (100) | ||||||||
| Predictability | 0.189 | 0.630 | 0.242 | ||||||
| ±0.50 D of emmetropia | 19 (76) | 23 (92) | 24 (96) | 23 (92) | 23 (92) | 22 (88) | |||
| ±1.00 D of emmetropia | 5 (20) | 2 (8) | 1 (4) | 2 (8) | 2 (8) | 3 (12) | |||
| ±1.50 D of emmetropia | 1 (4) | ||||||||
| Safety (CDVA) | 0.011 | 0.578 | 0.462 | ||||||
| Loss of 2 lines | 2 (8) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | |||
| Loss of 1 line | 4 (16) | 2 (9) | 2 (8) | 1 (4) | 0 (0) | 0 (0) | |||
| No loss of lines | 16 (64) | 14 (56) | 11 (44) | 13 (52) | 9 (36) | 11 (44) | |||
| Gain of 1 line | 3 (12) | 9 (39) | 11 (42) | 10 (40) | 15 (60) | 13 (52) | |||
| Gain of 2 lines or more | 0 (0) | 0 (0) | 1 (4) | 1 (4) | 1 (4) | 1 (4) | |||
Notes: Values represented as mean ± standard deviation (range);
a
Independent samples t-test.
Abbreviations: UDVA, uncorrected distance visual acuity; CDVA, corrected distance visual acuity.