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Table 1 Main Ocular Parameters (n = 106)

From: Ocular dimensions of the Chinese adolescents with keratoconus

Variables

Worse Eyes (n = 53)

Fellow Eyes (n = 53)

t valuea

P value

D-value

Mean ± SD

Mean ± SD

Range

Mean ± SD

Range

K1 (D)

50.72 ± 7.60

41.40 to 70.70

43.77 ± 2.95

35.50 to 54.30

6.922

< 0.001b

6.95 ± 7.30

K2 (D)

55.56 ± 8.15

43.20 to 74.60

46.38 ± 3.62

41.30 to 56.10

8.614

< 0.001b

9.18 ± 7.75

Kmax (D)

63.79 ± 11.49

45.20 to 86.90

50.03 ± 6.57

42.10 to 69.00

9.791

< 0.001b

13.76 ± 10.23

CCT (μm)

477.5 ± 42.7

377 to 576

515.0 ± 37.5

424 to 587

−8.350

< 0.001b

−37.57 ± 32.75

TCT (μm)

459.3 ± 45.8

331 to 541

504.3 ± 39.9

404 to 583

−7.933

< 0.001b

−45 ± 41.30

ACD (mm)

3.51 ± 0.32

2.62 to 4.39

3.36 ± 0.29

2.65 to 3.91

4.539

< 0.001b

0.15 ± 0.24

OAL (mm)

24.76 ± 1.24

22.26 to 27.28

24.97 ± 1.40

22.37 to 27.70

−3.120

0.003b

−0.21 ± 0.49

ASL (mm)

4.01 ± 0.30

3.19 to 4.88

3.94 ± 0.35

3.19 to 5.46

1.876

0.066

0.07 ± 0.25

PSL (mm)

20.76 ± 1.15

18.58 to 23.26

21.03 ± 1.31

18.50 to 23.54

−4.537

< 0.001b

−0.27 ± 0.44

  1. MRSE = manifest refraction spherical equivalent; D = diopter; K1 = flat keratometry value;K2 = steep keratometry value; Kmax = maximum keratometry value; CCT = central corneal thickness; TCT = thinnest corneal thickness, ACD = anterior chamber depth; OAL = optical axial length; ASL = anterior segment length; PSL = posterior segment length
  2. aPaird t-test
  3. bSignificant difference was detected between groups