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Table 1 Vascular measurements of HCL (N = 13) and NCL (N = 15) wearers in two visits

From: Inter-visit measurement variability of conjunctival vasculature and circulation in habitual contact lens wearers and non-lens wearers

  D (μm) Dbox D0 Q (pl/s) VA (mm/s) VS (mm/s)
HCL
 Visit 1 18.1 ± 4.0 1.64 ± 0.04 1.70 ± 0.05 150 ± 119 0.52 ± 0.15 0.37 ± 0.10
 Visit 2 16.8 ± 2.3 1.63 ± 0.06 1.70 ± 0.05 118 ± 62 0.51 ± 0.17 0.37 ± 0.12
 Diff 1.3 ± 3.2 0.01 ± 0.05 0.00 ± 0.04 32 ± 85 0.01 ± 0.10 0.01 ± 0.07
 Upper LOA 7.65 0.10 0.08 199 0.21 0.15
 Lower LOA −5.03 −0.08 − 0.08 − 135 − 0.18 −0.14
 ICC 0.60 0.64 0.64 0.72 0.81 0.78
 CV (%) 18.5 2.8 2.4 63.5 19.5 20.2
 CI of CV 25.6~11.4 3.9~1.7 3.4~1.5 88.0~39.1 27.1~12.0 27.9~12.4
NCL
 Visit 1 17.2 ± 2.4 1.62 ± 0.06 1.69 ± 0.06 116 ± 43 0.49 ± 0.13 0.36 ± 0.10
 Visit 2 16.8 ± 2.6 1.62 ± 0.06 1.70 ± 0.06 117 ± 53 0.51 ± 0.16 0.37 ± 0.12
 Diff 0.4 ± 2.5 0.00 ± 0.06 0.00 ± 0.06 −0.2 ± 47 −0.01 ± 0.11 −0.01 ± 0.08
 Upper LOA 5.3 0.12 0.11 93 0.20 0.14
 Lower LOA −4.5 −0.13 −0.12 −93 − 0.22 −0.16
 ICC 0.51 0.49 0.51 0.44 0.67 0.68
 CV (%) 14.7 3.8 3.4 40.6 21.4 21.1
 CI of CV 20.3~9.0 5.3~2.4 4.8~2.1 56.3~25.0 29.6~13.2 29.2~13.0
  1. HCL = habitual contact lens wearers; NCL = non-contact lens wearers; D = diameter; Dbox = fractal dimension processed using box counting indicating vessel density; D0 = multifractal dimension indicating vessel complexity; Q = blood flow volume; VA = axial blood flow velocity; VS = cross-sectional blood flow velocity; CV = coefficient of variation; ICC = interclass correlation coefficient; LOA = limit of agreement; CI of CV = confidence interval of CV