Pupil fields in a patient with early-onset postgeniculate lesion
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Pupil perimetry is becoming more common for its utility as an objective method to evaluate visual fields using pupillary response. The pupillary response has two main pathways: an afferent and an efferent limb. The afferent pathway leaves the optic tract before the lateral geniculate body and terminates in the midbrain. Wilhelm et al. reported that there are pupillary response abnormalities in patients with homonymous visual field defects caused by postgeniculate lesions . These findings challenge the neural pathway of the pupillary response. One of the possibilities is that retrograde trans-synaptic degeneration (RTSD) were observed within a few years after the onset of occipital damage using optical coherence tomography (OCT) [2, 3]. To clarify these findings, we have recorded the pupil fields in a patient with an “early-onset” postgeniculate lesion using a newly developed head-mounted perimeter.
The authors thank Robert E. Brandt, Founder, CEO, and CME, of MedEd Japan, for editing the manuscript.
This study was supported by a grant from Kitasato University School of Allied Health Sciences Grant in-Aid for Research Project, grant number 2018-1041. Also, this study was funded by CREWT Medical Systems. The funders provided the device without fee for 2 years.
Compliance with ethical standards
The tenets of the Declaration of Helsinki for research involving human subjects were followed, and informed consent was obtained. The protocol was approved by the Institutional Ethics Committee of Kitasato University (No. B17-031).
Conflict of interest
Ken Asakawa, received support for this study from CREWT Medical Systems; Hitoshi Ishikawa, none.
The patient has consented to the submission of the Letter to the Editor to the journal.