Table 2. Mean ± standard deviation of CST and ORA parameters and their intraclass correlation coefficient and coefficient of variation.
| Measurement | CV (%) | ICC | ||||
|---|---|---|---|---|---|---|
| 1st | 2nd | 3rd | average | |||
| IOP-corvis, mmHg | 13.0 ± 2.4 | 12.8 ± 2.3 | 12.6 ± 2.5 | 12.7 ± 2.1 | 5.5 ± 3.0 | 0.86 |
| (6.5 to 20.5) | (6.5 to 25.0) | (6.0 to 26.0) | (8.7 to 22.0) | (0.0 to 15.7) | [CI: 0.82 to 0.91] | |
| CCT-corvis, μm | 531.9 ± 35.2 | 532.0 ± 34.9 | 532.3 ± 34.7 | 531.2 ± 34.4 | 0.7 ± 0.0 | 0.98 |
| (456.0 to 624.0) | (458.0 to 627.0) | (461.0 to 624.0) | (458.3 to 624.3) | (0.1 to 2.3) | [0.98 to 0.99] | |
| A1 time, ms | 7.2 ± 0.3 | 7.2 ± 0.3 | 7.1 ± 0.3 | 7.2 ± 0.3 | 1.1 ± 3.0 | 0.89 |
| (6.6 to 8.1) | (6.5 to 8.7) | (6.5 to 8.7) | (6.7 to 8.3) | (0.0 to 4.1) | [0.85 to 0.92] | |
| A1 length, mm | 1.72 ± 0.1 | 1.7 ± 0.1 | 1.7 ± 0.01 | 1.7 ± 0.1 | 2.7 ± 3.0 | 0.44 |
| (1.3 to 1.9) | (1.3 to 1.9) | (1.3 to 1.9) | (1.4 to 1.8) | (0.1 to 18.2) | [0.32 to 0.56] | |
| A1 velocity, m/s | 0.2 ± 0.002 | 0.2 ± 0.01 | 0.2 ± 0.01 | 0.2 ± 0.01 | 4.9 ± 3.0 | 0.62 |
| (0.1 to 0.2) | (0.1 to 0.2) | (1.3 to 1.9) | (0.1 to 0.2) | (0.6 to 14.8) | [0.52 to 0.72] | |
| A2 time, ms | 21.8 ± 0.5 | 21.9 ± 0.5 | 21.9 ± 0.5 | 21.9 ± 0.4 | 0.8 ± 1.0 | 0.71 |
| (20.7 to 23.6) | (19.5 to 23.2) | (20.2 to 23.2) | (20.9 to 23.2) | (0.1 to 6.5) | [0.62 to 0.78] | |
| A1 deformation amplitude, mm | 0.1 ± 0.01 | 0.1 ± 0.01 | 0.1 ± 0.01 | 0.1 ± 0.01 | 3.6 ± 2.0 | 0.63 |
| (0.1 to 0.2) | (5.5 to 10.9) | (0.1 to 0.2) | (0.11 to 0.14) | (0.6 to 19.5) | [0.53 to 0.72] | |
| A2 length, mm | 1.7 ± 0.3 | 1.7 ± 0.3 | 1.6 ± 0.3 | 1.7 ± 0.2 | 15.1 ± 10.0 | 0.35 |
| (0.9 to 2.2) | (13.5 to 23.2) | (0.7 to 2.2) | (0.8 to 2.2) | (0.3 to 44.2) | [0.23 to 0.48] | |
| A2 velocity, m/s | -0.39 ± 0.1 | -0.4 ± 0.1 | -0.4 ± 0.01 | -0.4 ± 0.01 | -11.0 ± 8.0 | 0.66 |
| (-0.2 to -0.6) | (-0.01 to -0.7) | (-0.1 to -0.7) | (-0.6 to -0.2) | (-56.7 to -0.5) | [0.57 to 0.75] | |
| A2 deformation amplitude, mm | 0.4 ± 0.1 | 0.4 ± 0.1 | 0.4 ± 0.1 | 0.4 ± 0.1 | 7.9 ± 7.0 | 0.68 |
| (0.2 to 0.7) | (0.2 to 0.7) | (0.2 to 0.7) | (0.3 to 0.6) | (0.2 to 50.6) | [0.59 to 0.77] | |
| Peak Distance, mm | 3.5 ± 1.3 | 3.3 ± 1.2 | 3.3 ± 1.2 | 3.2 ± 0.8 | 23.7 ± 19.0 | 0.18 |
| (2.0 to 5.8) | (2.0 to 5.6) | (1.7 to 5.7 | (2.2 to 5.1) | (0.4 to 49.2) | [0.06 to 0.32] | |
| Highest concavity time, ms | 16.9 ± 0.7 | 16.9 ± 0.8 | 16.9 ± 0.8 | 17.0 ± 0.6 | 3.0 ± 2.0 | 0.36 |
| (14.1 to 18.7) | (14.8 to 18.5) | (14.3 to 18.5) | (15.4 to 18.4) | (0.0 to 11.8) | [0.23 to 0.49] | |
| Highest concavity deformation amplitude, mm | 1.1 ± 0.1 | 1.1 ± 0.1 | 1.1 ± 0.1 | 1.1 ± 0.1 | 3.3 ± 2.0 | 0.86 |
| (0.1 to 1.4) | (0.9 to 1.4) | (0.7 to 1.4) | (1.4 to 0.8) | (0.3 to 12.5) | [0.81 to 0.90] | |
| Radius, mm | 7.5 ± 1.0 | 7.5 ± 1.2 | 7.4 ± 1.0 | 7.4 ± 0.8 | 6.7 ± 4.0 | 0.65 |
| (2.0 to 5.8) | (2.0 to 5.6) | (6.7 to 11.0) | (5.9 to 10.3) | (0.6 to 19.5) | [0.55 to 0.74] | |
| IOP CC, mmHg | 14.7 ± 2.7 | 14.7 ± 3.0 | 14.6 ± 3.0 | 14.5 ± 1.5 | 6.7 ± 4.0 | 0.84 |
| (9.0 to 23.2) | (8.1 to 22.2) | (7.2 to 22.5) | (8.3 to 21.3) | (0.4 to 22.3) | [0.78 to 0.88] | |
| IOP-G, mmHg | 12.6 ± 3.0 | 12.5 ± 3.2 | 14.6 ± 3.0 | 12.4 ± 3.3 | 6.5 ± 4.0 | 0.91 |
| (5.5 to 21.0) | (5.2 to 20.9) | (7.2 to 22.5) | (3.8 to 20.1) | (0.7 to 21.4) | [0.88 to 0.94] | |
| CRF | 8.6 ± 1.5 | 8.5 ± 1.6 | 8.5 ± 1.5 | 8.5 ± 1.5 | 5.1 ± 4.0 | 0.90 |
| (5.3 to 13.0) | (4.3 to 14.1) | (4.8 to 13.2) | (5.3 to 13.0) | (0.5 to 25.0) | [0.86 to 0.93] | |
| CH | 9.3 ± 16.9 | 9.2 ± 1.4 | 9.3 ± 1.3 | 9.3 ± 1.2 | 5.3 ± 4.0 | 0.80 |
| (6.7 to 13.6) | (5.9 to 14.1) | (5.3 to 14.2) | (7.2 to 13.8) | (0.4 to 23.3) | [0.74 to 0.86] | |
All values were represented as mean ± standard deviation and (range) in upper and lower cell, respectively, except for ICC. ICC was represented as mean and [95% confidence interval] in upper and lower cell, respectively.
CST: Corvis ST tonometry, ORA: ocular response analyzer, CV: coefficient of variance, ICC: intraclass correlation, IOP: intraocular pressure, sd: standard deviation, CCT: central corneal thickness, CH: corneal hysteresis, CRF: corneal resistant factor