Table 3.
Summary of variance between the HandyRef-K-Retinomax, HandyRef-K-Plusoptix, Retinomax-Plusoptix, Table-top autorefractometer-Handyref-K, Table-top autorefractometer-Retinomax, and Table-top autorefractometer-Plusoptix measurements
| Mean difference | Standard deviation | 95% limits of agreement | P* | |
|---|---|---|---|---|
| HandyRef-Retinomax | ||||
| SP | -0.133 | 0.564 | -0.2153-(-0.04992) | 0.002 |
| CP | 0.187 | 0.432 | 0.1231-(0.2499) | p<0.0001 |
| Axis | 0.690 | 9.082 | -1.0026-(2.3831) | 0.421 |
| SE | -0.039 | 0.579 | -0.1243-(0.04559) | 0.362 |
| HandyRef-Plusoptix | ||||
| SP | 0.746 | 0.939 | 0.6082-(0.8835) | p<0.0001 |
| CP | 0.102 | 0.453 | 0.03573-(0.1687) | 0.003 |
| Axis | -0.115 | 11.583 | -2.2739-(2.0439) | 0.916 |
| SE | 0.797 | 0.939 | 0.6593-(0.9346) | p<0.0001 |
| Retinomax- Plusoptix | ||||
| SP | 0.878 | 0.986 | 0.7338-(1.0231) | p<0.0001 |
| CP | -0.084 | 0.282 | -0.1256-(-0.04295) | p= 0.0001 |
| Axis | -0.805 | 11.543 | -2.9569-(1.3463) | p= 0.460 |
| SE | 0.836 | 0.971 | 0.6940-(0.9787) | p<0.0001 |
| Table-top- HandyRef | ||||
| SP | -0.30 | 0.56 | -0.3833-(-0.2190) | p<0.001 |
| CP | -0.02 | 0.49D | -0.09934-(0.04254) | p= 0.431 |
| Axis | 2 | 8.7 | 0.3814-(3.6186) | p= 0.016 |
| SE | -0.32 | 0.59 | -0.4020-(-0.2287) | p<0.001 |
| Table-top-Retinomax | ||||
| SP | -0.43 | 0.59 | 0.5196 –(-0.3479) | p<0.001 * |
| CP | 0.16 | 0.30 | 0.1144-(0.2017) | p<0.001 |
| Axis | 2.69 | 9.6 | 0.930-(4.4776) | p= 0.004 |
| SE | -0.35 | 0.593 | -0.4417-(-0.2677) | p<0.001 |
| Autorefractometer-PlusOptix A09 | ||||
| SP | 0.45 | 0.77 | 0.3314-(0.5580) | p<0.001 |
| CP | 0.07 | 0.36 | 0.02164-(0.1260) | p= 0.006 |
| Axis | 1.9 | 11.30 | -0.2226-(3.9925) | p= 0.079 |
| SE | -0.48 | 0.74 | 0.3722-(0.5910) | p<0.001 |
*
Bland-Altman analysis; CP: Cylindrical power; SE: Spherical equivalent; SP: Spherical power; HandyRef-K: Nidek Co. Ltd., Tokyo, Japan; Plusoptix A09: Plusoptix GmbH, Nuremberg, Germany; Retinomax K-plus 3: Right Mfg. Co. Ltd., Tokyo, Japan; Table-top autorefractometer: URK 800, Unicos Co. Ltd., Daejeon, Republic of Korea.