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Table 1 Mean values (SD) and ranges of optic nerve head and peripapillary retinal nerve fibre layer (RNFL) assessed with Cirrus OCT, with intra- and inter-examiner variation

From: Repeatability, reproducibility and interocular difference in the assessments of optic nerve OCT in children– a Swedish population-based study

 

First examiner (n = 110)

Intra-examiner variation (n = 105)

Inter-examiner variation (n = 108)

Mean (SD)

Range

CV mean (SD)

ICC (CI)

CV mean (SD)

ICC (CI)

Average RFNL thickness (μm)

99.2 (8.8)

75.3–122.5

1.6% (1.2)

0.943 (0.920–0.961)

1.5% (1.4)

0.940 (0.914–0.959)

 Inferior

130.8 (15.1)

91.3–168.5

2.9% (2.1)

0.916 (0.882–0.942)

2.8% (2.4)

0.889 (0.841–0.923)

 Superior

123.2 (14.8)

66.0–167.0

3.0% (2.6)

0.848 (0.791–0.893)

2.8% (4.1)

0.851 (0.790–0.896)

 Nasal

74.4 (11.5)

47.0–102.3

3.3% (2.4)

0.925 (0.895–0.948)

3.1% (2.6)

0.925 (0.892–0.948)

 Temporal

67.8 (8.2)

47.3–84.0

3.9% (11)

0.894 (0.853–0.926)

3.2% (4.8)

0.767 (0.677–0.835)

Disc area (mm2)

1.89 (0.37)

1.09–3.02

4.2% (5.4)

0.919 (0.887–0.944)

2.9% (4.1)

0.949 (0.926–0.965)

Rim area (mm2)

1.52 (0.26)

1.10–2.29

3.8% (5.0)

0.902 (0.864–0.932)

2.8% (3.6)

0.929 (0.897–0.951)

Average C/D ratio

0.40 (0.15)

0.07–0.66

4.5% (8.4)

0.975 (0.964–0.983)

3.2% (4.8)

0.990 (0.985–0.993)

Vertical C/D ratio

0.39 (0.14)

0.06–0.63

7.5% (12)

0.942 (0.918–0.960)

4.6% (6.6)

0.977 (0.966–0.984)

Cup volume (mm3)

0.10 (0.10)

0.0–0.42

11.0% (23)

0.987 (0.982–0.991)

8.1% (12.4)

0.993 (0.990–0.995)

  1. C/D ratio cup disc ratio, CI confidence interval, CV coefficient of variance, ICC intraclass correlation, n number of eyes