Table 1 Comparisons of general characteristics among highly myopic eyes with C0, C1 and C2

Participant characteristics

 No. of eyes (%)

94 (6.6)

1077 (76.0)

247 (17.4)

 Age (years)

32.8 ± 10.4

35.1 ± 9.6

39.1 ± 10.1

 < 0.001^*

 < 0.001

 < 0.001

0.097

 Gender (male/female)

23 / 71

339 / 738

70 / 177

0.267^†

 > 0.05

 > 0.05

 > 0.05

 Height (cm)

162.7 ± 9.3

162.5 ± 8.1

161.0 ± 7.6

0.025^*

0.023

0.360

1.000

 Weight (kg)

62.5 ± 12.5

59.8 ± 10.8

59.9 ± 9.5

0.138^*

1.000

0.209

0.142

 SBP (mmHg)

116.5 ± 13.4

114.4 ± 14.1

114.7 ± 15.2

0.329^*

1.000

0.875

0.415

 DBP (mmHg)

68.0 ± 10

66.8 ± 10.1

67.7 ± 10.9

0.279^*

0.676

1.000

0.723

Ocular biological parameters

 No. of eyes (%)

94 (6.6)

1077 (76.0)

247 (17.4)

 AL (mm)

26.33 ± 1.02

26.79 ± 1.02

27.90 ± 1.20

 < 0.001^*

 < 0.001

 < 0.001

 < 0.001

 CCT (μm)

545 ± 32

540 ± 31

545 ± 33

0.037^*

0.093

1.000

0.304

 ACD (mm)

3.63 ± 0.31

3.57 ± 0.29

3.56 ± 0.27

0.165^*

1.000

0.199

0.207

 LT (mm)

3.84 ± 0.33

3.87 ± 0.36

3.94 ± 0.35

0.012^*

0.023

0.044

1.000

 Corneal curvature (D)

44.1 ± 1.6

43.8 ± 1.4

43.6 ± 1.5

0.029^*

0.149

0.039

0.348

 IOP (mmHg)

15.0 ± 2.6

14.4 ± 2.8

14.5 ± 2.8

0.127^*

1.000

0.334

0.127

 SER (D)

 − 7.37 ± 1.23

 − 8.06 ± 1.69

 − 10.11 ± 2.69

 < 0.001^*

 < 0.001

 < 0.001

 < 0.001

 BCVA (logMAR)

 − 0.028 ± 0.055

 − 0.028 ± 0.056

 − 0.007 ± 0.077

 < 0.001^*

 < 0.001

0.012

1.000

Visual function

 No. of eyes (%)

69 (5.6)

942 (77.1)

211 (17.3)

 VFI (%)

97 ± 2

96 ± 5

94 ± 6

 < 0.001^*

 < 0.001

 < 0.001

0.044

 MD (dB)

 − 3.13 ± 1.73

 − 3.48 ± 2.23

 − 4.92 ± 2.61

 < 0.001^*

 < 0.001

 < 0.001

0.430

 PSD (dB)

2.18 ± 1.42

2.32 ± 1.61

3.40 ± 1.93

 < 0.001^*

 < 0.001

 < 0.001

1.000