Table 2.
Mean (± standard deviation) differences (μm) in scleral spur landmark placement.
| All eyes (N = 31) by 2 readers (with adjudicator) (μm) |
Open-angle eyes (N = 12) by 2 readers (with adjudicator) (μm) |
Nonopen-angle eyes (N = 19) by 2 readers (with adjudicator) (μm) |
|
|---|---|---|---|
| x-axis difference | |||
|
| |||
| All quadrants | −16.5* ± 53.3 (−15.5 ± 41.8) |
−22.0 ± 41.6 (−11.8 ± 47.0) |
−13.0 ± 59.5 (−17.8 ± 38.3) |
|
| |||
| Horizontal | |||
| Nasal | −25.7 ± 71.9 (−19.7 ± 45.4) |
−43.0 ± 52.0 (−30.0 ± 44.1) |
−14.8 ± 81.5 (−13.2 ± 46.2) |
| Temporal | −8.7 ± 41.0 (−13.5 ± 35.2) |
−13.0 ± 15.7 (−5.8 ± 33.6) |
−6.0 ± 51.2 (−18.3 ± 36.3) |
| Vertical | |||
| Superior | −20.1 ± 49.7 (−6.8 ± 46.7) |
−18.7 ± 45.6 (4.7 ± 59.9) |
−21.1 ± 53.3 (−14.1 ± 36.0) |
| Inferior | −11.4 ± 46.2 (−22.0 ± 39.2) |
−13.5 ± 41.4 (−16.0 ± 45.3) |
−10.1 ± 50.0 (−25.8 ± 35.6) |
|
| |||
|
P value (H versus V) |
0.8597 (0.7646) |
0.3283 (0.3632) |
0.6162 (0.6198) |
|
| |||
| y-axis difference | |||
|
| |||
| All quadrants | 1.5* ± 52.8 (0.4 ± 47.6) |
−8.0 ± 52.7 (−0.8 ± 59.2) |
7.5 ± 52.4 (1.2 ± 39.0) |
|
| |||
| Horizontal | |||
| Nasal | −2.2 ± 50.5 (2.8 ± 43.7) |
−14.6 ± 44.3 (−5.1 ± 33.5) |
5.6 ± 53.7 (7.8 ± 49.3) |
| Temporal | 10.3 ± 52.2 (5.5 ± 42.7) |
10.9 ± 47.1 (13.7 ± 54.9) |
9.9 ± 56.5 (0.4 ± 33.5) |
| Vertical | |||
| Superior | 7.2 ± 45.4 (9.9 ± 45.6) |
5.2 ± 51.2 (19.0 ± 64.2) |
8.5 ± 42.7 (4.1 ± 29.4) |
| Inferior | −9.2 ± 62.1 (−16.0 ± 55.3) |
−33.4 ± 60.9 (−30.8 ± 71.2) |
6.0 ± 59.4 (−7.5 ± 42.1) |
|
| |||
|
P value (H versus V) |
0.5713 (0.3844) |
0.4071 (0.5494) |
0.9670 (0.5234) |
*A negative mean difference indicates that observer 1 is closer to the center of the image.