TABLE 4.
Agreement and Correlation between RTVue and Stratus Measurements
| Healthy Participants | Glaucoma Patients | |||
|---|---|---|---|---|
| Optic Disc Parameters | Mean Difference (range) | r2 (P) | Mean Difference (range) | r2 (P) |
| TEMP RNFL (µm) | 7.5 (−13.5 to 28.5) | 0.44 (<.001) | 5.4 (−7.5 to 18.2) | 0.75 (<.001) |
| SUP RNFL (µm) | −3.6 (−23.8 to 16.7) | 0.6 (<.001) | 2.1 (−20.1 to 24.2) | 0.71 (<.001) |
| NAS RNFL (µm) | −3.6 (−25.9 to 18.8) | 0.58 (<.001) | 0.3 (−18.9 to 19.5) | 0.65 (<.001) |
| INF RNFL (µm) | 6.4 (−13.8 to 26.6) | 0.74 (<.001) | 10.8 (−7 to 28.5) | 0.83 (<.001) |
| AVG RNFL (µm) | 1.7 (−8.6 to 12) | 0.81 (<.001) | 4.6 (−5.6 to 14.8) | 0.86 (<.001) |
| Disc area (mm2) | −0.4 (−1 to 0.2) | 0.31 (<.001) | −0.4 (−0.8 to 0) | 0.82 (<.001) |
| Cup area (mm2) | −0.1 (−0.7 to 0.6) | 0.75 (<.001) | −0.1 (−0.6 to 0.4) | 0.84 (<.001) |
| Rim area (mm2) | −0.3 (−1.1 to 0.4) | 0.22 (.002) | −0.3 (−0.7 to 0.1) | 0.67 (<.001) |
| Rim volume (mm3) | −0.3 (−0.8 to 0.1) | 0.78 (<.001) | −0.2 (−0.5 to 0.2) | 0.76 (<.001) |
| Cup-to-disc ratio | 0.0 (−0.3 to 0.4) | 0.65 (<.001) | 0.1 (−0.2 to 0.3) | 0.77 (<.001) |
AVG = average quadrant; INF = inferior quadrant; NAS = nasal quadrant; SUP = superior quadrant; RNFL = retinal nerve fiber layer; TEMP = temporal quadrant.
Agreement is expressed in terms of the mean difference between measurements from the 2 instruments (mean difference) and the 95% limits of agreements between the measurements (range). Correlation is expressed as the r 2 with the level of significance (P value). Mean difference = RTVue minus Stratus.