Retrobulbar Hemodynamics and Visual Field Progression in Normal Tension Glaucoma: A Long-Term Follow-Up Study

Table 2

Correlation between VFI progression and other parameters including CDI parameters using Fisher’s transformation ( was perceived as a statistical significant correlation). When removing one outlier (visual field progression index −6.1 dB per year) the correlation of the PSV of the CRA (, ) and of RI of the NPCA (, ) was no longer significant.

Correlation between VFI progression and other parameters	Correlation coefficient	value
MD	0.44	0.01
Age	−0.09	0.63
IOP	−0.18	0.33
MAP	−0.19	0.31
Number of visual field tests	−0.14	0.47
Follow-up period	−0.24	0.20
PSV of the OA	−0.33	0.06
EDV of the OA	−0.26	0.16
RI of the OA	0.004	0.98
PSV of the CRA	0.37	0.04
EDV of the CRA	0.14	0.46
RI of the CRA	0.27	0.15
PSV of the NPCA	−0.20	0.29
EDV of the NPCA	0.13	0.51
RI of the NPCA	−0.43	0.01
PSV of the TPCA	−0.14	0.47
EDV of the TPCA	−0.14	0.48
RI of the TPCA	0.07	0.72

VFI: Visual Field Index.
MD: medial deviation.
IOP: intraocular pressure.
MAP: medial arterial pressure.
PSV: peak systolic velocity.
EDV: end-diastolic velocity.
RI: resistive index.
OA: ophthalmic artery.
CRA: central retinal artery.
NPCA: nasal posterior ciliary artery.
TPCA: temporal posterior ciliary artery.