山形大学紀要（医学） 第35巻 第2号（2017）39-48
A novel method for evaluating the visual field using
magnetoencephalography : A simple objective method using
the P100m latency and magnetic moment
Hayato Funiu, Kenichiro Matsuda, Kaori Sakurada, Yasuaki Kokubo,
Shinya Sato, Yukihiko Sonoda, Takamasa Kayama
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.
Key words : Magnetoencephalography; visual evoked field; P100m; visual field impairments; pituitary
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