Table 3.
Patient characteristics
| Parameter | PRK | LASIK | SMILE | p value |
|---|---|---|---|---|
| Eyes, n (%) | ||||
| R | 17 (46) | 177 (49) | 7 (64) | |
| L | 20 (54) | 183 (51) | 4 (36) | |
| Age* (years) | 34 ± 11 (18 to 57) | 33 ± 8 (18 to 62) | 28 ± 7 (23 to 43) | 0.26 |
| Sex, n (%) | ||||
| M | 22 (71) | 334 (51) | 5 (71) | |
| F | 9 (29) | 316 (49) | 2 (29) | |
| Preoperative MRSE*a | − 4.2 ± 3.8 (− 12.8 to 7.6) | − 6.9 ± 5.6 (− 28.0 to 18.5) | − 5.0 ± 2.7 (− 8.8 to − 2.0) | 0.33 |
| Preoperative anterior Km* (D) | 43.7 ± 1.6 (39.7 to 46.1) | 43.6 ± 1.8 (39.4 to 49.9) | 43.6 ± 1.7 (40.9 to 45.3) | 0.97 |
|
Preoperative CCT*a (μm) |
495 ± 39 (363 to 555) | 529 ± 37 (414 to 631) | 508 ± 47 (418 to 582) | < 0.01‡ |
|
Ectasia onset*a (months) |
41 ± 50 (0.25 to 192) | 35 ± 24 (0.20 to 132) | 18 ± 13 (1 to 48) | 0.06 |
| Postoperative RSB*a (μm) | 384 ± 41 (285 to 433) | 238 ± 55 (80 to 426) | 349 ± 40 (305 to 389) | < 0.01‡† |
| PTA*a (%) | 24 ± 6 (15 to 40) | 45 ± 10 (23 to 66) | 37 ± 4 (32 to 41) | < 0.01‡# |
PRK photorefractive keratometry, LASIK laser-assisted in situ keratomileusis, SMILE small-incision lenticule extraction, MRSE manifest refractive spherical equivalent, D diopters, CCT central corneal thickness, RSB residual stromal bed, PTA percent tissue altered
*Reported as mean ± SD (range)
‡Significance between PRK and LASIK
†Significance between PRK and SMILE
#Significance between LASIK and SMILE
aTukey HSD