Table 2.
Preoperative and postoperative parameters comparing WF-optimized to WF-guided hyperopic LASIK
| Parameter | Mean ± standard deviation, range
|
Pa | |
|---|---|---|---|
| WF-guided (n=11) | WF-optimized (n=11) | ||
| Preoperative | |||
| UDVAb | 0.36±0.25, −0.10 to 0.80 | 0.40±0.20, 0.10 to 0.80 | 0.56 |
| CDVAb | −0.15±0.05, −0.20 to −0.10 | −0.15±0.07, −0.20 to 0.00 | 1.00 |
| CDVAb <5% contrast | 0.19±0.09, 0.10 to 0.40 | 0.18±0.10, 0.00 to 0.30 | 0.43 |
| CDVAb <25% contrast | 0.17±0.06, 0.10 to 0.30 | 0.19±0.07, 0.10 to 0.30 | 0.60 |
| Sphere (D) | 1.30±0.81, 0.00 to 3.00 | 1.61±0.66, 0.25 to 2.75 | 0.23 |
| Astigmatism (D) | 0.86±0.63, 0.00 to 2.50 | 0.64±0.57, 0.00 to 2.00 | 0.12 |
| Spherical equivalent (D) | 1.73±0.66, 0.88 to 3.38 | 1.93±0.64, 1.25 to 3.25 | 0.68 |
| Coma | 0.21±0.15, 0.06 to 0.60 | 0.18±0.13, 0.05 to 0.47 | 0.48 |
| Trefoil | 0.13±0.09, 0.04 to 0.31 | 0.14±0.10, 0.04 to 0.38 | 0.61 |
| RMS error (μm) | 0.35±0.15, 0.17 to 0.72 | 0.36±0.17, 0.09 to 0.59 | 0.93 |
| Postoperative month 1 | |||
| UDVAb | −0.06±0.15, −0.20 to 0.20 | −0.05±0.17, −0.20 to 0.40 | 1.00 |
| CDVAb | −0.16±0.09, −0.30 to 0.00 | −0.14±0.09, −0.20 to 0.00 | 0.46 |
| CDVAb <5% contrast | 0.23±0.09, 0.10 to 0.40 | 0.25±0.08, 0.10 to 0.40 | 0.83 |
| CDVAb <25% contrast | 0.19±0.08, 0.10 to 0.40 | 0.22±0.10, 0.10 to 0.40 | 0.75 |
| Sphere (D) | −0.41±0.36, −1.00 to 0.00 | −0.41±0.32, −1.25 to 0.00 | 1.00 |
| Astigmatism (D) | 0.25±0.39, 0.00 to 1.25 | 0.45±0.38, 0.00 to 1.00 | 0.32 |
| Spherical equivalent (D) | −0.30±0.26, −0.75 to 0.12 | −0.18±0.29, −0.75 to 0.25 | 0.23 |
| Coma | 0.13±0.08, 0.00 to 0.26 | 0.16±0.09, 0.04 to 0.29 | 0.37 |
| Trefoil | 0.10±0.05, 0.04 to 0.17 | 0.14±0.12, 0.01 to 0.41 | 0.28 |
| RMS error (μm) | 0.23±0.06, 0.12 to 0.32 | 0.28±0.11, 0.15 to 0.50 | 0.15 |
| Postoperative month 3 | |||
| UDVAb | −0.10±0.21, −0.30 to 0.40 | −0.11±0.13, −0.20 to 0.20 | 1.00 |
| CDVAb | −0.19±0.10, −0.30 to 0.00 | −0.16±0.05, −0.20 to −0.10 | 0.72 |
| CDVAb <5% contrast | 0.22±0.09, 0.10 to 0.40 | 0.24±0.08, 0.10 to 0.40 | 0.86 |
| CDVAb <25% contrast | 0.20±0.12, 0.10 to 0.50 | 0.20±0.07, 0.10 to 0.30 | 1.00 |
| Sphere (D) | −0.28±0.28, −0.75 to 0.25 | −0.45±0.35, −1.25 to 0.00 | 0.30 |
| Astigmatism (D) | 0.20±0.26, 0.00 to 0.75 | 0.30±0.33, 0.00 to 0.75 | 0.49 |
| Spherical equivalent (D) | −0.18±0.25, −0.62 to 0.25 | −0.30±0.29, −0.88 to 0.12 | 0.40 |
| Coma | 0.15±0.13, 0.05 to 0.51 | 0.16±0.11, 0.03 to 0.39 | 0.77 |
| Trefoil | 0.09±0.04, 0.03 to 0.17 | 0.11±0.06, 0.02 to 0.22 | 0.23 |
| RMS error (μm) | 0.23±0.13, 0.10 to 0.55 | 0.28±0.13, 0.10 to 0.53 | 0.16 |
| Postoperative month 6 | |||
| UDVAb | −0.13±0.11, −0.30 to 0.10 | −0.08±0.13, −0.20 to 0.20 | 0.52 |
| CDVAb | −0.17±0.10, −0.30 to 0.00 | −0.18±0.06, −0.30 to −0.10 | 0.93 |
| CDVAb <5% contrast | 0.19±0.07, 0.10 to 0.30 | 0.21±0.07, 0.10 to 0.30 | 0.67 |
| CDVAb <25% contrast | 0.19±0.10, 0.10 to 0.40 | 0.20±0.09, 0.10 to 0.30 | 0.95 |
| Sphere (D) | −0.25±0.33, −0.75 to 0.50 | −0.41±0.23, −0.75 to 0.00 | 0.20 |
| Astigmatism (D) | 0.14±0.17, 0.00 to 0.50 | 0.34±0.26, 0.00 to 0.75 | 0.07 |
| Spherical equivalent (D) | −0.16±0.36, −0.62 to 0.75 | −0.24±0.26, −0.62 to 0.25 | 0.34 |
| Coma | 0.15±0.09, 0.02 to 0.33 | 0.15±0.15, 0.02 to 0.42 | 0.64 |
| Trefoil | 0.11±0.06, 0.03 to 0.21 | 0.11±0.06, 0.01 to 0.20 | 0.70 |
| RMS error (μm) | 0.25±0.08, 0.09 to 0.38 | 0.29±0.14, 0.11 to 0.52 | 0.33 |
| Postoperative month 12 | |||
| UDVAb | −0.11±0.09, −0.30 to 0.00 | −0.08±0.12, −0.20 to 0.20 | 1.00 |
| CDVAb | −0.18±0.08, −0.30 to 0.10 | −0.15±0.07, −0.20 to 0.00 | 0.43 |
| CDVAb <5% contrast | 0.24±0.08, 0.10 to 0.40 | 0.26±0.10, 0.20 to 0.50 | 0.60 |
| CDVAb <25% contrast | 0.24±0.08, 0.10 to 0.40 | 0.25±0.14, 0.10 to 0.50 | 1.00 |
| Sphere (D) | −0.23±0.31, −0.75 to 0.50 | −0.25±0.47, −0.75 to 0.50 | 0.89 |
| Astigmatism (D) | 0.20±0.27, 0.00 to 0.75 | 0.23±0.33, −0.25 to 0.75 | 1.00 |
| Spherical equivalent (D) | −0.12±0.32, −0.75 to 0.50 | −0.11±0.46, −0.75 to 0.62 | 0.90 |
| Coma | 0.18±0.12, 0.02 to 0.42 | 0.19±0.14, 0.05 to 0.47 | 0.64 |
| Trefoil | 0.09±0.04, 0.05 to 0.19 | 0.11±0.05, 0.02 to 0.18 | 0.28 |
| RMS error (μm) | 0.26±0.10, 0.13 to 0.45 | 0.29±0.13, 0.13 to 0.53 | 0.44 |
Notes:
a
P-values for means are by paired Wilcoxon signed-rank test for nonparametrically distributed data from a small sample.
b
Visual acuities are by logarithm of the minimal angle of resolution.
Abbreviations: CDVA, corrected distance visual acuity; D, diopter; LASIK, laser in situ keratomileusis; RMS, root mean square; UDVA, uncorrected distance visual acuity; WF, wavefront.