Table 1 Intraobserver repeatability outcomes for biometric measurements obtained using AL-Scan partial coherence interferometry in children.

From: Precision of a new ocular biometer in children and comparison with IOLMaster

Parameter

observer

Mean ± SD

Sw

TRT

CoV (%)

ICC

AL (mm)

1st

23.83 ± 1.22

0.03

0.09

0.14

0.999

2nd

23.82 ± 1.22

0.03

0.09

0.14

0.999

CCT (μm)

1st

547.40 ± 31.97

1.81

5.01

0.33

0.997

2nd

547.42 ± 31.98

1.79

4.95

0.33

0.997

ACD (mm)

1st

3.81 ± 0.20

0.01

0.04

0.34

0.995

2nd

3.82 ± 0.20

0.01

0.03

0.30

0.997

Kf (D)

1st

43.76 ± 1.54

0.10

0.27

0.23

0.996

2nd

43.77 ± 1.54

0.10

0.28

0.23

0.997

Ks (D)

1st

42.47 ± 1.43

0.09

0.24

0.20

0.996

2nd

42.50 ± 1.44

0.08

0.23

0.19

0.996

Km (D)

1st

43.11 ± 1.44

0.08

0.21

0.17

0.997

2nd

43.13 ± 1.44

0.08

0.21

0.18

0.997

Astigmatism

1st

1.28 ± 0.80

0.11

0.30

8.54

0.982

2nd

1.28 ± 0.83

0.11

0.29

8.28

0.984

J0 (D)

1st

−0.61 ± 0.40

0.05

0.15

—

0.981

2nd

−0.61 ± 0.41

0.06

0.15

—

0.982

J45 (D)

1st

0.06 ± 0.21

0.06

0.16

—

0.928

2nd

0.06 ± 0.20

0.05

0.13

—

0.946

CD (mm)

1st

12.08 ± 0.35

0.14

0.38

1.12

0.862

2nd

12.05 ± 0.35

0.14

0.39

1.15

0.859

PD

1st

7.94 ± 0.59

0.08

0.22

1.00

0.982

2nd

7.96 ± 0.57

0.07

0.20

0.90

0.984

  1. AL = axial length, CCT = central corneal thickness, ACD = anterior chamber depth, Kf = flattest keratometry, Ks = steepest keratometry, Km = mean keratometry, CD = corneal diameter, SD = standard deviation, Sw = within-subject standard deviation, TRT = test-retest repeatability (2.77 Sw), CoV = within-subject coefficient of variation, ICC = intraclass correlation coefficient.
Back to article page