Departmental Bulletin Paper A novel method for evaluating the visual field using magnetoencephalography : A simple objective method using the P100m latency and magnetic moment
脳磁図を用いた視野評価方法の開発
A novel method for evaluating the visual field using magnetoencephalography : A simple objective method using the P100m latency and magnetic moment

舟生, 勇人  ,  松田, 憲一郎  ,  櫻田, 香  ,  小久保, 安昭  ,  佐藤, 慎哉  ,  園田, 順彦  ,  嘉山, 孝正

Description
Objective: Goldman perimetry is currently widely used to subjectively evaluate the visual field.However, this modality is difficult to use in infants or patients with communication difficulties, and other objective evaluation methods are needed. In this study, we report the simple objective method using the visual evoked field (VEF) on magnetoencephalography (MEG).Methods: We measured the hemifield VEF waveforms in 75 patients suffering from pituitary adenoma and examined the P100m latency and magnetic moment (dipole moment and confidence volume) in comparison with the Goldmann perimetry findings.Results: The specificity of the VEF for detecting a normal visual field on Goldmann perimetry was 95.2%, while the sensitivity of the VEF for detecting visual field abnormalities on Goldmann perimetry was 88.6%. In addition to the P100m latency, the magnetic moment were found to be extremely sensitive parameters for detecting visual field impairments.Conclusions: This simple objective and easy method using the P100m latency and magnetic moment of VEF on MEG provides an excellent ability to examine the visual field.
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