Table 2. Intereye comparison of ocular parameters in the asymmetric and symmetric groups.
| Worse eye | Better eye | P* | |
|---|---|---|---|
| Asymmetric group | |||
| Number of eyes, n | 110 | 110 | NA |
| Mean deviation, dB | -14.07 ± 4.76 (-31.10 – -6.21) | -4.01 ± 3.02 (-12.17 – 2.41) | <0.001 |
| Spherical equivalent, D | -3.05 ± 3.27 (-9.50 – +1.0) | -2.78 ± 3.17 (-10.00 – +1.0) | 0.006 |
| Untreated initial IOP, mmHg | 16.52 ± 2.37 | 16.03 ± 2.41 | 0.001 |
| Central corneal thickness, μm | 536.3 ± 32.7 | 537.3 ± 32.7 | 0.292 |
| Ovality index | 1.211 ± 0.172 | 1.178 ± 0.146 | 0.008 |
| Torsion, degree | 14.11 ± 16.25 | 14.49 ± 17.12 | 0.768 |
| PPA/disc area ratio | 0.664 ± 0.410 | 0.538 ± 0.395 | <0.001 |
| Myopic asymmetric group | |||
| Number of eyes, n | 66 | 66 | NA |
| Mean deviation, dB | -14.14 ± 4.63 (-28.29 – -6.21) | -4.26 ± 3.05 (-11.51 – 0.88) | <0.001 |
| Spherical equivalent, D | -5.13 ± 2.43 (-9.50 – -1.38) | -4.77 ± 2.52 (-10.00 – +0.38) | 0.004 |
| Untreated initial IOP, mmHg | 16.70 ± 2.31 | 16.42 ± 2.19 | 0.072 |
| Central corneal thickness, μm | 540.3 ± 29.0 | 541.4 ± 28.0 | 0.35 |
| Ovality index | 1.274 ± 0.185 | 1.215 ± 0.170 | 0.001 |
| Torsion, degree | 14.37 ± 17.05 | 16.35 ± 18.60 | 0.241 |
| PPA/disc area ratio | 0.773 ± 0.441 | 0.641 ± 0.458 | 0.003 |
| Nonmyopic asymmetric group | |||
| Number of eyes, n | 44 | 44 | NA |
| Mean deviation, dB | -14.00 ± 5.07 (-31.10 – -7.52) | -3.61 ± 2.94 (-10.69 – 2.41) | <0.001 |
| Spherical equivalent, D | +0.26 ± 0.54 (-0.75 – +1.00) | +0.14 ± 0.74 (-2.00 – +1.00) | 0.080 |
| Untreated initial IOP, mmHg | 16.23 ± 2.47 | 15.41 ± 2.64 | 0.003 |
| Central corneal thickness, μm | 530.2 ± 37.1 | 531.2 ± 38.2 | 0.584 |
| Ovality index | 1.115 ± 0.083 | 1.125 ± 0.070 | 0.318 |
| Torsion, degree | 13.73 ± 15.17 | 11.70 ± 14.40 | 0.298 |
| PPA/disc area ratio | 0.499 ± 0.291 | 0.384 ± 0.196 | 0.007 |
| Symmetric group | |||
| Number of eyes, n | 45 | 45 | NA |
| Mean deviation, dB | -15.08 ± 6.95 (-29.89 – -6.77) | -14.02 ± 6.81 (-29.33 – -6.07) | <0.001 |
| Spherical equivalent, D | -2.96 ± 2.91 (-10.50 – +1.00) | -2.88 ± 2.76 (-10.00 – +1.00) | 0.561 |
| Untreated initial IOP, mmHg | 16.03 ± 2.27 | 15.95 ± 2.40 | 0.719 |
| Central corneal thickness, μm | 531.0 ± 29.6 | 531.7 ± 30.4 | 0.619 |
| Ovality index | 1.182 ± 0.111 | 1.190± 0.129 | 0.600 |
| Torsion, degree | 15.80 ± 24.38 | 12.69 ± 17.49 | 0.252 |
| PPA/disc area ratio | 0.719 ± 0.434 | 0.770 ± 0.676 | 0.449 |
NA, not applicable; dB, decibel; D, diopters; IOP, intraocular pressure; PPA, peripapillary atrophy;
Unless otherwise indicated, data are given as the mean ± SD (range).
* P value was calculated by paired t-test.