Table 2

Retrobulbar blood flow velocity parameters at baseline and the 18-month visit, as measured by a colour Doppler imaging device

Baseline mean (cm/s) (SD)18-month mean (c/s) (SD)△retrobulbar flowp Value
OA PSV26 (10)27.52 (9)1.520.1213
OA EDV6.10 (2.4)5.80 (2.5)−0.300.0438
OA RI0.75 (0.07)0.77 (0.06)0.270.0001
CRA PSV8.48 (1.9)8.9 (2.4)0.420.193
CRA EDV2.46 (0.7)2.60 (0.7)0.140.147
CRA RI0.70 (0.07)0.70 (0.04)0.000.6857
NPCA PSV7.70 (1.8)8.23 (1.8)0.530.0018
NPCA EDV2.53 (0.7)2.96 (0.7)0.43<0.0001
NPCA RI0.67 (0.06)0.64 (0.05)−0.03<0.0001
TPCA PSV8.00 (1.8)8.58 (1.7)0.580.0061
TPCA EDV2.60 (0.7)3.11 (0.8)0.51<0.0001
TPCA RI0.68 (0.06)0.64 (0.05)−0.04<0.0001
  • p values <0.05 are shown in bold.

  • CRA, central retinal artery; EDV, end diastolic velocity; NPCA, nasal short posterior ciliary artery; OA, ophthalmic artery; PSV, peak systolic velocity; RI, resistance index; TPCA, temporal short posterior ciliary artery; Δ, change.