Table 2.
Functional and Structural Outcomes
| RGPCL (n = 67) | HCL (n = 17) | HGCL (n = 12) | p-value | ||
|---|---|---|---|---|---|
| Functional Analysis | BCVA | ||||
| BCVA-S, decimal | 0.4±0.2 | 0.4±0.3 | 0.5±0.2 | 0.199 | |
| BCVA-CL,decimal | 0.9±0.2 | 0.9±0.2 | 0.8±0.1 | 0.618 | |
| Contrast sensitivity | |||||
| Mean PCS, dB | 19.3±2.6 | 20.6±2.8 | 17.3±2.7 | 0.006 | |
| Mean MCS, dB | 13.9±3.7 | 15.4±2.8 | 12.8±2.7 | 0.121 | |
| Analysis of light scattering in the retina | |||||
| OSI | 3.7±2.9 | 3.8±2.7 | 5.8±3.4 | 0.134 | |
| PVA100, decimal | 0.6±0.3 | 0.5±0.2 | 0.4±0.3 | 0.131 | |
| PVA20, decimal | 0.4±0.2 | 0.3±0.2 | 0.3±0.2 | 0.120 | |
| PVA9, decimal | 0.2±0.1 | 0.2±0.1 | 0.2±0.1 | 0.054 | |
| MTF, c/deg | 17.1±8.6 | 14.3±6.8 | 12.0±8.4 | 0.105 | |
| Pupil size, mm | 4.3±2.1 | 3.2±2.3 | 4.4±2.5 | 0.161 | |
| Impact of tear film on dynamic optical quality | |||||
| VBUT, sec | 2.1±2.6 | 2.1±2.5 | 2.9±2.0 | 0.227 | |
| dOSI | 4.8±3.1 | 5.5±2.8 | 8.3±4.3 | 0.024 | |
| maxOSI | 6.6±4.2 | 8.1±5.1 | 10.1±4.8 | 0.040 | |
| minOSI | 3.7±2.9 | 3.9±2.3 | 6.5±3.7 | 0.037 | |
| ampOSI | 2.9±2.7 | 4.1±4.6 | 3.6±2.0 | 0.165 | |
| STRUCTURAL ANALYSIS | Corneal tomographic parameters | ||||
| minK, dioptre | 48.6±6.1 | 46.2±3.9 | 43.8±5.2 | 0.034 | |
| maxK, dioptre | 52.4±5.5 | 51.6±3.7 | 49.1±4.8 | 0.294 | |
| meanK, dioptre | 50.4±5.7 | 48.6±3.6 | 44.0±7.6 | 0.020 | |
| TP, µm | 423.5±74.0 | 489.7±77.1 | 484.4±76.6 | 0.011 | |
| BAD-D | 11.7±5.4 | 7.1±3.9 | 7.7±4.5 | 0.013 | |
| RMS-HOA, µm | 3.7±1.6 | 3.2±1.7 | 3.0±1.7 | 0.372 | |
| RMS-TOTAL, µm | 11.6±4.3 | 11.0±3.8 | 10.0±5.8 | 0.601 | |
| Posterior pole tomographic parameters | |||||
| CMT, µm | 286.4±26.4 | 283.8±22.0 | 293.2±29.3 | 0.617 | |
| SCT, µm | 284.0±115.2 | 284.4±120.0 | 261.4±124.1 | 0.822 | |
| OD-NFL, µm | 98.6±13.2 | 96.2±18.0 | 98.4±10.5 | 0.818 | |
Notes: Bold number represents a statistically significant p-value. Values represent mean ± standard deviation.
Abbreviations: ampOSI, OSI amplitude; BAD-D, Belin-Ambrósio deviation index; BCVA, best-corrected visual acuity, BCVA-CL, best-corrected visual acuity with contact lens, BCVA-S, best-corrected visual acuity with spectacles; CMT, central macular thickness; dOSI, OSI dynamically measured 40 times in a 20 second period as a surrogate of tear film stability; HCL, hybrid contact lens; HGCL, silicone hydrogel/hydrogel contact lens; MCS, contrast sensitivity under mesopic conditions; maxOSI, OSI maximum; minOSI, OSI minimum; MTF, modular transfer function; OD-NFL, optic disc nerve fiber layer thickness; OSI, objective scatter index; PCS, contrast sensitivity under photopic conditions; PVA100, predicted visual acuities (decimal) within the 100% contrast level; PVA20, predicted visual acuities (decimal) within the 20% contrast level; PVA9, predicted visual acuities (decimal) within the 9% contrast level; RGPCL, rigid gas permeable contact lens; RMS-HOA, root mean square higher-order aberration; RMS-TOTAL, root mean square total; SCT, subfoveal choroidal thickness; TP, corneal thickness at the thinnest point; VBUT, vision break-up time.