Skip to main content
. Author manuscript; available in PMC: 2013 Jul 19.
Published in final edited form as: Biomed Sci Instrum. 2012;48:415–422.

Table 2.

Ranges, group means and standard deviations (SD) for the diffusion coefficients, scaling exponents, and critical point coordinates for eyes open on rigid floor, eyes closed on rigid floors and eyes open on anti-fatigue floor conditions. Dxs and Dxl are short term and long term diffusion coefficients respectively in anterio-posterior direction. Dys and Dyl are short term and long term diffusion coefficients respectively in medio-lateral direction. Drs and Drl are short term an long term planar diffusion coefficients respectively.

Eyes closed on rigid floor Eyes open on rigid floor Eyes Open on Anti-fatigue Mat
Parameter
Diffusion coefficients (mm2 s−1)		 Mean ± SD Range Mean ± SD Range Mean ± SD Range
Dxs 0.54±0.28 0.2018–1.01 0.38±0.34 0.1344–1.24 0.46±0.18 0.1901–0.77
Dxl 1.74±1.07 0.5395–4.07 1.01±0.68 0.4302–2.52 1.57±0.85 0.5561–3.01
Dys 0.16±0.11 0.0536–0.48 0.10±0.03 0.0359–0.15 0.22±0.22 0.0553–0.67
Dyl 0.41±0.29 0.0808–1.23 0.32±0.18 0.0545–0.66 0.57±0.75 0.1510–2.65
Drs 0.69±0.32 0.2770–1.20 0.48±0.36 0.1695–1.39 0.67±0.30 0.2846–1.26
Drl 2.15±1.19 0.6203–4.58 1.33±0.75 0.4867–2.91 2.14±1.28 0.8510–4.68
Scaling exponents Hxs 0.76±0.10 0.5566–0.92 0.73±0.08 0.6254–0.86 0.77±0.06 0.6727–0.84
Hxl 0.68±0.06 0.5377–0.76 0.66±0.08 0.4813–0.77 0.68±0.07 0.5344–0.76
Hys 0.71±0.12 0.5905–0.96 0.72±0.10 0.6269–0.90 0.79±0.12 0.6334–0.92
Hyl 0.62±0.12 0.3072–0.74 0.66±0.13 0.3008–0.80 0.62±0.08 0.4396–0.72
Hrs 0.74±0.10 0.5630–0.89 0.72±0.08 0.6260–0.86 0.77±0.07 0.6287–0.84
Hrl 0.67±0.06 0.5249–0.75 0.67±0.09 0.4494–0.76 0.67±0.07 0.5136–0.75
Critical point coordinates (sec) Δtxc 0.19±0.66 0.0100–2.38 0.21±0.68 0.0100–2.37 0.26±0.79 0.0100–2.50
Δtyc 0.38±0.91 0.0003–2.10 0.21±0.68 0.0003–2.09 0.37±0.81 0.0004–3.30
Δtrc 0.19±0.65 0.0100–2.50 0.21±0.68 0.0100–2.36 0.26±0.78 0.0100–2.40
Critical point coordinates (mm2) <Δx2>c 0.16±0.58 0.0002–1.32 0.18±0.60 0.0001–0.49 0.33±1.04 0.0001–0.84
<Δy2>c 0.13±0.37 0.0100–2.37 0.04±0.14 0.0100–2.36 0.16±0.34 0.0100–2.47
<Δr2>c 0.19±0.68 0.0004–2.47 0.22±0.74 0.0005–2.57 0.41±1.30 0.0006–4.12