Table 5 Comparison of characteristics between highly myopic eyes with PPA+BM and without PPA+BM (with PPA−BM only).

From: Parapapillary atrophy and changes in the optic nerve head and posterior pole in high myopia

Variables

Eyes with PPA+BM (n = 62)

Eyes with PPA−BM only (n = 19)

P value*

IOP (mmHg)

14.00 ± 2.32

13.58 ± 2.65

0.509

Axial length (mm)

27.11 ± 0.94

26.91 ± 0.77

0.397

BMO area (mm2)

2.75 ± 0.69

2.68 ± 0.85

0.720

PPA+BM width (μm)

339.76 ± 159.51

0

<0.001

PPA−BM width (μm)

395.40 ± 196.25

400.10 ± 189.11

0.852

LC thickness (μm)

182.82 ± 30.29

202.79 ± 31.23

0.009

Anterior laminar depth (μm)

346.97 ± 109.29

293.84 ± 93.05

0.029

FoBMO angle (°)

−4.50 ± 3.66

−6.02 ± 4.22

0.007

Macular BM length (μm)

4121.66 ± 321.21

3894.79 ± 350.03

0.010

Presence of LC defect, n (%)

29 (46.77)

9 (47.37)

0.995

Subfoveal CT (μm)

221.40 ± 85.76

250.74 ± 93.02

0.037

Peripapillary CT (μm)

Global

143.41 ± 42.48

135.63 ± 47.51

0.500

Temporal-superior

153.46 ± 50.48

153.63 ± 65.42

0.990

Temporal

123.20 ± 50.34

135.37 ± 66.93

0.399

Temporal-inferior

112.13 ± 41.56

113.00 ± 44.85

0.938

Nasal-inferior

125.33 ± 41.10

113.21 ± 40.28

0.263

Nasal

164.56 ± 45.94

136.63 ± 38.35

0.065

Nasal-superior

170.10 ± 50.17

161.16 ± 51.67

0.503

  1. IOP = intraocular pressure; BMO = Bruch’s membrane opening; PPA+BM = β-parapapillary atrophy with Bruch’s membrane; PPA−BM = β-parapapillary atrophy without Bruch’s membrane; LC = lamina cribrosa; FoBMO angle = angle of fovea-to-BMO-center axis relative to the horizontal axis of the image frame; BM = Bruch’s membrane; CT = choroidal thickness.
  2. Values with statistical significance are shown in boldface.
  3. *P values derived from Student’s t-test in normally distributed continuous variables, Mann-Whitney U test in non-normally distributed continuous variables, and chi-square test in categorical variable.
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