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Circulation changes may affect visual field in normal tension glaucoma
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Damage to the visual field in normal tension glaucoma may be related to changes in circulation in the optic nerve head, a study suggests. The researchers note that such changes may be less involved in visual field damage in primary open-angle glaucoma.
Kiyoshi Yaoeda, MD, and colleagues at Niigata University, Japan, evaluated the relationship between blood flow velocity around the optic nerve head and visual field loss in patients with glaucoma. They examined 44 eyes of 44 patients with POAG and 44 eyes of 44 patients with NTG in the study.
According to the study, the average square blur rate at the superior and inferior temporal neuroretinal rim was positively correlated with mean deviation in the NTG group (P = .02) and with the sum of the total deviations in the corresponding hemifields (P = .049, P = .019).
Correlations between square blur rate and mean deviations were not statistically different between the groups. Additionally, no significant correlation between square blur rate and visual field indices was observed in the POAG group.
The study is published in the journal Acta Ophthalmologica Scandinavica.