Table 2 Baseline ocular aberration metrics of orthokeratology subjects in both groups (median [range] or mean ± SD)
Ocular aberration metrics (µm) | 6-MM (n = 22) | 5-MM (n = 21) | P |
|---|---|---|---|
RMS of total lower-order aberrations | 1.67 ± 0.53 | 1.99 ± 0.48 | 0.049* |
\({\mathrm{Defocus }(\mathrm{C}}_{2}^{0})\) | 1.65 ± 0.54 | 1.96 ± 0.47 | 0.052 |
RMS of total higher-order aberrations | 0.10 ± 0.03 | 0.09 ± 0.03 | 0.319 |
RMS of spherical aberrations | 0.03 ± 0.02 | 0.03 ± 0.02 | 0.605 |
Primary spherical aberration (\({\mathrm{C}}_{4}^{0})\) | 0.03 ± 0.03 | 0.03 ± 0.02 | 0.874 |
Secondary spherical aberration (\({\mathrm{C}}_{6}^{0})\) | 0.00 [0.00 to 0.00] | 0.00 [− 0.02 to 0.00] | 0.244 |
RMS of comatic aberrations | 0.05 [0.02 to 0.13] | 0.05 [0.01 to 0.14] | 0.473 |
Primary vertical coma (\({\mathrm{C}}_{3}^{-1})\) | 0.03 ± 0.06 | 0.03 ± 0.05 | 0.631 |
Primary horizontal coma (\({\mathrm{C}}_{3}^{1}\)) | 0.00 ± 0.03 | 0.00 ± 0.03 | 0.586 |
Secondary vertical coma (\({\mathrm{C}}_{5}^{-1})\) | 0.00 ± 0.00 | 0.00 ± 0.00 | 0.107 |
Secondary horizontal coma (\({\mathrm{C}}_{5}^{1})\) | 0.00 ± 0.00 | 0.00 ± 0.00 | 0.513 |