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Br J Ophthalmol 87:1241-1246 doi:10.1136/bjo.87.10.1241
  • Clinical science
    • Extended reports

Influence of LASIK on scanning laser polarimetric measurement of the retinal nerve fibre layer with fixed angle and customised corneal polarisation compensation

Table 3

Polarimetric values measured with the fixed angle corneal compensator at baseline and on days 1 and 6 after uncomplicated LASIK

Baseline (1) Day 1 (2) Day 6 (3)
SLP-F parameter Mean (SD) 95% CI Mean (SD) 95% CI Mean (SD) 95% CI p Value
p# = ANOVA for repeated measurements p* Sheffe’s test.
The definitions of the parameters are shown in Table 1.
Superior maximum (μm) 88.0 (23.8) 74.8 to 101.2 83.3 (20.0) 72.2 to 94.4 83.6 (23.2) 70.7 to 96.4 p*1–2 = 0.026 p*1–3 = 0.036 p*2–3 = 0.990
Inferior maximum (μm) 93.0 (29.0) 76.9 to 109.1 90.1 (24.4) 76.6 to 103.6 90.1 (24.9) 76.3 to 103.8 p# = 0.089
Normalised superior area 0.113 (0.037) 0.093 to 0.134 0.104 (0.040) 0.082 to 0.126 0.105 (0.042) 0.082 to 0.128 p*1–2 = 0.025 p*1–3 = 0.061 p*2–3 = 0.920
Normalised inferior area 0.126 (0.044) 0.101 to 0.150 0.119 (0.044) 0.095 to 0.143 0.118 (0.045) 0.093 to 0.143 p# = 0.039 p*1–2 = 0.116 p*1–3 = 0.061 p*2–3 = 0.948
Superior ratio 2.65 (0.96) 2.12 to 3.18 2.55 (0.85) 2.08 to 3.03 2.47 (0.75) 2.06 to 2.89 p# = 0.403
Inferior ratio 2.76 (0.97) 2.23 to 3.30 2.76 (0.94) 2.23 to 3.28 2.66 (0.77) 2.24 to 3.09 p# = 0.722
Superior/nasal ratio 2.37 (0.88) 1.88 to 2.86 2.39 (0.88) 1.90 to 2.88 2.39 (0.90) 1.89 to 2.89 p# = 0.957
Maximal modulation (μm) 2.05 (0.97) 1.51 to 2.59 2.12 (0.90) 1.63 to 2.61 2.02 (0.79) 1.58 to 2.46 p# = 0.714
Ellipse modulation (μm) 3.47 (1.28) 2.76 to 4.18 3.25 (1.15) 2.61 to 3.88 3.26 (0.96) 2.73 to 3.79 p# = 0.615
Ellipse standard deviation 24.98 (5.87) 21.74 to 28.23 23.84 (6.27) 20.37 to 27.31 23.92 (6.49) 20.32 to 27.52 p# = 0.150
Symmetry 0.97 (0.17) 0.87 to 1.06 0.94 (0.11) 0.88 to 1.00 0.94 (0.13) 0.87 to 1.01 p# = 0.329
The number 19.13 (16.77) 9.85 to 28.42 17.00 912.46) 10.10 to 23.90 18.40 (15.52) 9.81 to 26.99 p# = 0.675

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