Table 3 The mean difference, paired t-test, 95% LoA and ICC for biometric measurements differences between the two different operators based on a single method (from the first reading from each operator) using OA-2000 swept-source optical coherence tomography in cataract patients.

From: Precision of a new ocular biometer in eyes with cataract using swept source optical coherence tomography combined with Placido-disk corneal topography

Device Pairings

Mean Difference ± SD

P Value*

95% LoA

ICC (95% CI)

AL (mm)

0.00 ± 0.02

0.845

−0.05 to 0.04

1.000 (0.999 to 1.000)

CCT (μm)

−0.12 ± 4.60

0.825

−9.12 to 8.89

0.990 (0.985 to 0.994)

ACD (mm)

0.00 ± 0.03

0.565

−0.06 to 0.06

0.996 (0.993 to 0.997)

LT (mm)

−0.03 ± 0.15

0.077

−0.33 to 0.27

0.923 (0.882 to 0.951)

Ks (Φ = 2.5) (D)

−0.03 ± 0.18

0.099

−0.40 to 0.33

0.993 (0.989 to 0.995)

Kf (Φ = 2.5) (D)

0.03 ± 0.23

0.209

−0.41 to 0.48

0.990 (0.984 to 0.994)

Km (Φ = 2.5) (D)

−0.00 ± 0.16

0.934

−0.32 to 0.32

0.995 (0.992 to 0.997)

Ks (Φ = 3.0) (D)

−0.01 ± 0.15

0.491

−0.31 to 0.29

0.995 (0.993to 0.997)

Kf (Φ = 3.0) (D)

0.00 ± 0.19

0.820

−0.37 to 0.38

0.993 (0.989 to 0.996)

Km (Φ = 3.0) (D)

0.00 ± 0.13

0.808

−0.26 to 0.25

0.997 (0.995 to 0.998)

WTW (mm)

0.02 ± 0.17

0.262

−0.30 to 0.34

0.897 (0.843 to 0.933)

  1. AL = Axial length, ACD = anterior chamber depth, K = keratometry, WTW = white to white, SD = Standard deviation.
  2. *Two ways.
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