Table 2.
Comparisons of Pre- and Postoperative Visual Acuity, Refractive and keratometric variables
| Variable | Preoperative values | Postoperative values | P value |
|---|---|---|---|
| UDVA (logMAR) | |||
| Mean ± SD | 1.14 ± 0.32 | 0.35 ± 0.24 | < 0.001 |
| Range | 0.40, 1.6 | 0.0, 1.0 | |
| CDVA (logMAR) | |||
| Mean ± SD | 0.47 ± 0.20 | 0.22 ± 0.15 | < 0.001 |
| Range | 0.1, 1.0 | 0.0, 0.7 | |
| Sphere(D) | |||
| Mean ± SD | -8.18 ± 2.58 | -0.32 ± 2.15 | < 0.001 |
| Range | -15, -6 | -5.5, 3.5 | |
| Cylinder(D) | |||
| Mean ± SD | -4.59 ± 1.86 | -2.00 ± 1.51 | < 0.001 |
| Range | -9.5, -0.6 | -5.0, 1.5 | |
| Spherical equivalent(D) | |||
| Mean ± SD | -10.51 ± 2.81 | -1.32 ± 2.29 | < 0.001 |
| Range | -17.37, -6.3 | -7.0, 2.25 | |
| K max (D) | 53.62 ± 3.57 | 48.96 ± 3.55 | < 0.001 |
| K min (D) | 48.58 ± 3.16 | 46.15 ± 3.78 | < 0.001 |
| K mean (D) | 51.06 ± 3.26 | 47.51 ± 3.57 | < 0.001 |
UDVA: uncorrected distance visual acuity, logMAR: Logarithm of the Minimum Angle of Resolution, CDVA: corrected distance visual acuity, D: diopter, Kmax: maximum keratometry value in D, Kmin: minimum keratometry value in D, Kmean: mean keratometry value in D. Based on the previously mentioned guidelines, a 5-mm-diameter MyoRing was used for 21 eyes (65.6%) and a 6-mm-diameter MyoRing was used for the remaining 11 eyes. The between-group differences in the median changes at 3 months after surgery in sphere and spherical equivalent were significant (Table 3). The median change in sphere for the 5- and 6-mm-diameter MyoRing groups was 8.5 and 6 D, respectively (P = 0.027), and the median change in spherical equivalent for the 5- and 6-mm-diameter MyoRing groups was 10 and 7 D, respectively (P = 0.027). However, the between-group differences in the median changes in UDVA, CDVA, and cylinder were not significant (Table 3).